supported timezone and ISO8601 https://github.com/globaleaks/GlobaLeaks/issues/55, updated DB
implemented ISO8601 datetime and timezone utils https://github.com/globaleaks/GlobaLeaks/issues/55
fixed unitTest for ISO861 datetime https://github.com/globaleaks/GlobaLeaks/issues/55
Merge pull request #81 from globaleaks/feature/isoformat

Feature/isoformat