Implement first version of formatting functionality.
Merge branch 'master' into format-date

Conflicts:
	lib/datetime.ts
	timezonecomplete.v12.suo
Add static formatter to DateTime.
Add preliminary tests for week and timezone formatting.
Merge branch 'master' into format-date
weekNumber() was implemented, so format that one.
Add some documentation for formatting.
Create new release build.
Merge pull request #12 from daanwissing/master

Implement DateTime.format() functionality