Bug 55610 - time data error

Removed timestamp format conversion in xmlreader.py
[now in will be returned in ISO 8601 (no timezone), as from API]

Conversion from ISO 8601 (no timezone) to MediaWiki format
is done in wikipedia.py, using parsetime2stamp().

Change-Id: I0ce152b2bb85a33a0b91b2b95879f9a90a4268f4
Merge "Bug 55610 - time data error"