While using compile 'com.google.android.gms:play-services:9.4.0' we have to add
a) multiDexEnabled true
in our defaultConfig
in build.gradle(app)
b) The 9.4.0 or 9.0+ versions have some bug so downgrade the play-services version to 8.0+
Also to commit here again do : git pull --rebase origin master