Updated to current pytz 2013.8

Updated to current pytz 2013.8 (as downloaded from PyPi); including the zoneinfo.

Modified code (at least the portion under pytz-appengine control) to adhere to PEP8 recommendations.

Moved the template "pytz" folder to "template"; such that the output doesn't overwrite the source code. This is perhaps a matter of taste, but initially I thought the "pytz-appengine/pytz" folder had additional customizations; and was surprised by it being overwritten. In fact, I believe that there is no direct need to keep such a folder, as the "python build.py all" will create it anyway. There might be value in keeping "template" (or "pytz") to allow other developers to examine the result when browsing the project on Github.