Adding ThreeTen Android backport
Adding ThreeTen Android backport

ThreeTen-Backport provides a backport of the Java SE 8 date-time
classes to Java SE 6 and 7.
This is needed, because Android is stuck with Java.util.Date
and this is obviously a pain to work with.

Links:
- http://www.threeten.org/threetenbp/index.html
- https://github.com/JakeWharton/ThreeTenABP

philipphager/disclosure-android-app