Merge pull request #636 from Wizcorp/develop

Merge develop
Merge pull request #637 from Wizcorp/develop

Update plugin.xml
Update plugin.xml

This fixes issue https://github.com/Wizcorp/phonegap-facebook-plugin/issues/654
For more info see https://github.com/facebook/facebook-android-sdk/issues/379#issuecomment-54845869
Merge pull request #657 from josemedaglia/patch-1

Fix black screen before login (Android)