fix: cordova can't build the project #59

[mobiRic]

Installs missing Bolts v1.2.1 library automatically.

This is a very small and simple fix to enable users to build Android without any workarounds based on the Bolts library.

Previously users would have to download the library from:

• http://mvnrepository.com/artifact/com.parse.bolts/bolts-android/1.2.1

They would copy it into the Android platform's libs folder, and their project would build.

This pull request fixes that and installs the bolts-android-1.2.1.jar file automatically.

(ref: issue https://github.com/avivais/phonegap-parse-plugin/issues/59)

[budda]

Excellent! So that's how it's done properly ! :-)

Please merge back in.