BUG: DatetimeIndex with time object as key
closes https://github.com/pydata/pandas/issues/8667
on master:

```
>>> from datetime import time
>>> from pandas.index import _SIZE_CUTOFF
>>> n = _SIZE_CUTOFF + 100
>>> idx = pd.date_range('2014-11-26', periods=n, freq='S')
>>> ts = pd.Series(np.random.randn(n), index=idx)
>>> key = time(15, 0)
>>> ts[key]
TypeError: 'datetime.time' object is not iterable
>>> ts.index.get_loc(key)
TypeError: unorderable types: int() > datetime.time()
```

above would work on master branch if `n` was smaller than `_SIZE_CUTOFF`. 
`_SIZE_CUTOFF` is set [here](https://github.com/pydata/pandas/blob/e5fe75e8d40e6b94eabf54882a17ab05341c9929/pandas/index.pyx#L68)

@behzadnouri looks good. can you run a perf check just to be sure nothing significant has changed. ping when ready (post if their is a problem, otherwise say a-ok).
 I ran the benchmarks and I got below; I cannot run the `vb_suite` on my home machine (which is python 3), but I tried a number of the benchmarks in the bottom with `%timeit` and I do not see any difference in performance.

For the last benchmark which is worst, it does not even hit [this line](https://github.com/pydata/pandas/pull/8907/files#diff-23ecb29e7ceba52109a365e447400d2eR1213) or [this line](https://github.com/pydata/pandas/pull/8907/files#diff-23ecb29e7ceba52109a365e447400d2eR1253). Since the benchmarks were ran on a shared server, it may have been on a different load and that has impacted result.

```
-------------------------------------------------------------------------------
Test name                                    | head[ms] | base[ms] |  ratio   |
-------------------------------------------------------------------------------
frame_reindex_axis1                          | 157.1807 | 204.6683 |   0.7680 |
melt_dataframe                               |   4.6460 |   6.0183 |   0.7720 |
timeseries_day_apply                         |   0.0126 |   0.0153 |   0.8238 |
frame_reindex_axis0                          | 132.8634 | 126.6564 |   1.0490 |
....
frame_xs_mi_ix                               |   3.3040 |   3.1153 |   1.0606 |
timeseries_day_incr                          |   0.0149 |   0.0140 |   1.0682 |
frame_reindex_both_axes_ix                   |  54.4243 |  50.6121 |   1.0753 |
frame_reindex_both_axes                      |  54.3477 |  50.4670 |   1.0769 |
frame_dropna_axis0_any                       |  88.5150 |  81.9420 |   1.0802 |
datetimeindex_normalize                      |   4.4916 |   4.1403 |   1.0849 |
frame_dropna_axis0_all                       | 124.3957 | 113.2793 |   1.0981 |
index_int64_intersection                     |  30.5480 |  27.0540 |   1.1292 |
frame_mask_bools                             |  23.4393 |  20.1070 |   1.1657 |
dtype_infer_timedelta64_2                    |  25.8369 |  20.1476 |   1.2824 |
series_xs_mi_ix                              |   7.5959 |   3.0520 |   2.4888 |
-------------------------------------------------------------------------------
Test name                                    | head[ms] | base[ms] |  ratio   |
-------------------------------------------------------------------------------

Ratio < 1.0 means the target commit is faster then the baseline.
Seed used: 1234

Target [0ef5c07] : BUG: DatetimeIndex with time as key
Base   [e5fe75e] : Merge pull request #8752 from selasley/trailing_spaces_fix

Update tokenizer to fix #8679 #8661
```
 thanks!

I think the timing on the last one was messed up somehow. Looked ok to me when I did it.
 @behzadnouri we get an error in this test:

```
INSTALLED VERSIONS
------------------
commit: 844f7ae082be2b853f6c195b863c062962a558ba
python: 2.7.8.final.0
python-bits: 32
OS: Linux
OS-release: 3.13.0-39-generic
machine: i686
processor: i686
byteorder: little
LC_ALL: None
LANG: en_US.UTF-8

pandas: 0.15.1-102-ga3e478d
nose: 1.3.4
Cython: 0.20.2
numpy: 1.9.1
scipy: 0.14.0
```

```
======================================================================
ERROR: test_time_loc (pandas.tests.test_index.TestDatetimeIndex)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/joris/scipy/pandas/pandas/tests/test_index.py", line 1900, in test_time_loc
    ts = pd.Series(np.random.randn(n), index=idx)
  File "/home/joris/scipy/pandas/pandas/core/series.py", line 212, in __init__
    data = SingleBlockManager(data, index, fastpath=True)
  File "/home/joris/scipy/pandas/pandas/core/internals.py", line 3371, in __init__
    ndim=1, fastpath=True)
  File "/home/joris/scipy/pandas/pandas/core/internals.py", line 2099, in make_block
    placement=placement)
  File "/home/joris/scipy/pandas/pandas/core/internals.py", line 76, in __init__
    len(self.values), len(self.mgr_locs)))
ValueError: Wrong number of items passed 999900, placement implies 2
```
 A bit strange, we are here with two, and both getting an error, but a different one, for this test, with master.
 did u rebuild the cython?
eg make 
 yes, we were also thinking that, and for @papaloizouc that solved it, but I keep getting the error, strange ..
 hmm u r in 32-but linux ?
could be related to that
 yep
 I can't further dig in at the moment, but some quick runs in the console:

```
In [4]:  from pandas.index import _SIZE_CUTOFF

In [5]:  ns = _SIZE_CUTOFF + np.array([-100, 100])

In [6]: ns
Out[6]: array([ 999900, 1000100])

In [7]: n = ns[0]

In [8]:  idx = pd.date_range('2014-11-26', periods=n, freq='S')

In [9]: idx
Out[9]: 
<class 'pandas.tseries.index.DatetimeIndex'>
[2014-11-26 00:00:00, 2014-11-26 00:00:01]
Length: 2, Freq: S, Timezone: None

In [10]: n
Out[10]: 999900
```

So it gives here an index of length 2, while we say it should have 999900 periods.
 fixed here: https://github.com/pydata/pandas/commit/e759d99f520e1217f7ce6ca8bfc33e4c10c8d29f

which shows a minor compat issue
https://github.com/pydata/pandas/issues/8943
 yep, I can confirm that this fixes it
