TimezoneConverter: Adding failing test for bug #684
TimezoneConverter: Permitting lowercase timezones
TimezoneConverter: Explicitly returning output
TimezoneConverter: Adding HTML output and some tests to ensure the text and html output is the same
TimezoneConverter: Adding CSS copied from Conversions
TimezoneConverter: Adding primary span around both times
Merge pull request #685 from duckduckgo/mintsoft/TimezoneConverter

TimezoneConverter: Fixing #684