v3.0 (Parse Server support without Push notification)

This releases extends parse4cn1 with support for the open source Parse Server! This unfortunately necessitated an API change - Parse.initialize() now takes an additional parameter that specifies the Parse backend.

Furthermore, this release does NOT include Push notification support which may be implemented in a future release.

Note also that the library has been upgraded to Java 8 (although the implementation has not been changed yet to use any Java 8 features so the library can still be compiled for Java 5 by reverting the changes outlined here).