Remove duplicated bolts library

bolts.jar has been upgraded to bolts-android-1.1.2.jar after https://github.com/Wizcorp/phonegap-facebook-plugin/commit/43fb61f1916daf1faf51ee1cb08223566eb3d854

Having this duplicated libraries is causing issues when building for Android.
Merge pull request #723 from josemedaglia/patch-2

Remove duplicated bolts library