BUG: to_timedelta of a scalar returns a scalar, closes #5410.
closes #5410

@danielballan I think this is just a trivial test fix...can you have a look...want to do this for 0.13
 Yep, the key was `if not _np_version_under1p7`. If the build passes, we should be good to go.

Note to selves: Testing on to_timedelta is pretty light.
 Hrm. This passes on my box with numpy 1.7.1. Weird. Will take another looks later.
 you are comparnig that result with assert_series_equal, but you should be using assert_almost_equal (as they are arrays and not series)
 this looks fine....pls give 1 more rebase and can merge it
 Done.
 feel free to add more tests to to_timedelta (its not _so_ light...but more tests are better!)
 Yeah, that was my mistake. I was looking at the smattering of tests under pandas/tests, completely missing pandas/tseries/tests!
 np...in theory they should be consolidated..but no big deal really
 thanks@!
