DatesRole: Use unambiguous date string for month-in-itself.

`month` is numeric, which makes it horribly ambiguous when presented in
that way. With `month_name` there is no doubt.
Merge pull request #722 from mwmiller/this_month

DatesRole: Use unambiguous date string for month-in-itself.
TimezoneConverter: Adding tests around DST
TimezoneConverter: Removing most of the regexes from the tests to keep it explicit
Merge pull request #724 from duckduckgo/mintsoft/tz_fixes

TimezoneConverter: Adding tests around DST