Use JavaScript instead of javascript in pkg descriptions
Style changes in tests
Implement moment.fn.utcOffset, base moment.fn.zone on top
Add isLocal(), isUtc() == isUTC(), isUtcOffset()
Deprecate zone function in favor of utcOffset
Remove zone from comments
Switch zone to utcOffset in some tests
offset -> utc_offset
Convert all zone tests to utc offset
Fix a few broken tests in UTC timezone