now accepts +hh:mm and Z (UTC) timezones
added a simple gruntfile for running tests
Merge branch 'feat-gruntfile' into dev
Merge branch 'feat-parse-other-tz-formats' into dev

Conflicts:
	dateparser.js
now accepts +hh:mm and Z (UTC) timezones (tests)
Merge branch 'feat-parse-other-tz-formats' into dev