add setTZ
All Day date formatting does not include TZ.
Merge branch 'master' of https://github.com/leeqiang/ical-generator into leeqiang-master
Merge branch 'leeqiang-master'
Add unit tests for #11
Merge branch 'patch-1' of https://github.com/mikeal/ical-generator into mikeal-patch-1
Merge branch 'mikeal-patch-1'
Changed unit test for #13
version bump