Fix unrecognized 'Z' UTC designator
closes #8771 

This time PR is green ;-)
 @broessli update on this?
 @jreback I've been very busy and I think some thoughts and refactoring are
in order to fix all this properly (I don't like the idea of reusing
out_local), but unfortunately I don't have time to do it right now. I've
corrected the behavior of the internal parser regarding 'Z' specifier, but
the issue raised here has to do with the way the internal and
fallback/external parser are interacting which to me needs some non trivial
refactoring

Le vendredi 21 novembre 2014, jreback notifications@github.com a écrit :

> @broessli https://github.com/broessli update on this?
> 
> —
> Reply to this email directly or view it on GitHub
> https://github.com/pydata/pandas/pull/8832#issuecomment-64034328.

## 

Benoît.
 @broessli ok, pls squash / rebase. Let's push thru this change as is, then pls add another issue (which I''ll mark for the future), to possibly handle the 2 error cases that we discussed above (list them in the top of the issue so you or whomever gets to it won't forget).

thanks
 @jreback rebase done, PR green, sorry for the delay, have been away with no access to my home computer
 thanks!
