Travis should only sign and build APK on master branch (#2162)
Travis should only sign and build APK on master branch (#2162)


misaochan/apps-android-commons,commons-app/apps-android-commons,domdomegg/apps-android-commons,dbrant/apps-android-commons,misaochan/apps-android-commons,neslihanturan/apps-android-commons,misaochan/apps-android-commons,domdomegg/apps-android-commons,misaochan/apps-android-commons,maskaravivek/apps-android-commons,neslihanturan/apps-android-commons,domdomegg/apps-android-commons,neslihanturan/apps-android-commons,psh/apps-android-commons,misaochan/apps-android-commons,dbrant/apps-android-commons,commons-app/apps-android-commons,nicolas-raoul/apps-android-commons,dbrant/apps-android-commons,nicolas-raoul/apps-android-commons,nicolas-raoul/apps-android-commons,maskaravivek/apps-android-commons,domdomegg/apps-android-commons,neslihanturan/apps-android-commons,commons-app/apps-android-commons,commons-app/apps-android-commons,domdomegg/apps-android-commons,psh/apps-android-commons,maskaravivek/apps-android-commons,psh/apps-android-commons,misaochan/apps-android-commons,neslihanturan/apps-android-commons,nicolas-raoul/apps-android-commons,maskaravivek/apps-android-commons,commons-app/apps-android-commons,psh/apps-android-commons,maskaravivek/apps-android-commons,psh/apps-android-commons,dbrant/apps-android-commons