Update calendarContext.xml

American/Hawaii is not a valid timezone.  It should be US/Hawaii.  See the following:
http://www.vmware.com/support/developer/vc-sdk/visdk400pubs/ReferenceGuide/timezone.html or http://en.wikipedia.org/wiki/Zone.tab
Merge pull request #18 from tefreestone/patch-1

Update calendarContext.xml