Added a slightly wider range of accepted ISO8601 date formatting in NativeSubclass.DateExtended.
Fixed incorrect getting of 'half hour' GMTOffsets in NativeSubclass.DateExtended.
Merge pull request #147 from vidalvanbergen/master

Added a slightly wider range of accepted ISO8601 date formatting in NativeSubclass.DateExtended.
Merge pull request #69 from macoslib/master

Merge changes