BUG: off-by-one when doing network test repeats
Imagine num_runs is two, then runs will take on the values [0, 1] and runs < 
num_uns will always be False. Hence any genuine Exception the code might
raise will be silently ignored and just printed.

thanks for catching this, can you hook up travis ci
 Not sure what to do about the Travis error though.
 Think it has been failing all along, but unnoticed.
 this is marked as issue #4427 (the failing test), which was reported.....
 My guess is, it should look like  46f6c43 
 I see, well in that case, let's just ignore the fix I made?
 @esc your fix is good; was just linking the issue that needs to be fixed (your are fixing the test that was not catching this issue) thxs!
 Doesn't fail on `master` though :confused: 
 That test needs prob just needs to come out...it really just needs to check that the reader 'works', rather than comparing a value which gets revised (and of course they don't tell you that!)
 I'm +>9000 on removing that test!
 @esc why don't u put a skip test in the failing test that you uncovered
 btw - the original PR is a nice object lesson for why tests are important for correct code :sweat_smile:
 And now I get this one:

https://travis-ci.org/esc/pandas/jobs/9918210
 ```
======================================================================

ERROR: test_string_select (pandas.io.tests.test_pytables.TestHDFStore)

----------------------------------------------------------------------

Traceback (most recent call last):

File "/home/travis/virtualenv/python2.7_with_system_site_packages/local/lib/python2.7/site-packages/pandas-0.12.0_127_g46f6c43-py2.7-linux-x86_64.egg/pandas/io/tests/test_pytables.py", line 2424, in test_string_select

result = store.select('df',Term('x!=none'))

File "/home/travis/virtualenv/python2.7_with_system_site_packages/local/lib/python2.7/site-packages/pandas-0.12.0_127_g46f6c43-py2.7-linux-x86_64.egg/pandas/io/pytables.py", line 475, in select

raise KeyError('No object named %s in the file' % key)

KeyError: 'No object named df in the file'
```
 its ok unrelated 2 u
 So I am now skipping the unstable test. Problem is that Python 2.6 `unittest` module has no `skip`. What could/should I use as an alternative? Also the `pytables` test mentioned above is still failing. BTW: can/should I rebase this onto master?
 yes rebase onto master
 @esc just `raise nose.SkipTest`.
 @esc how's this coming?
 Okay, worked out how to skip the test properly. gonna rebase and then it'll be ready to merge.
 Rebased onto current master, please merge.
 @esc can you add a skip test to test_fred_nan and test_fred_parts? Then we can merge this. Going to open an issue that they need to be fixed.
 Merged (I added two more skip tests for Fred). Thanks!
 Thanks for adding the missing skips and for merging!
