AndroidProject: Delete unaligned APK after build
AndroidProject: Delete unaligned APK after build

This leaves only the APKs that are actually going to be used, and
thus avoids any confusion.

Fixes #4

crosswalk-project/crosswalk-app-tools,baleboy/crosswalk-app-tools,pozdnyakov/crosswalk-app-tools,shawngao5/crosswalk-app-tools,davidmaxwaterman/crosswalk-app-tools,pozdnyakov/crosswalk-app-tools,hgl888/crosswalk-app-tools,crosswalk-project/crosswalk-app-tools,shawngao5/crosswalk-app-tools,crosswalk-project/crosswalk-app-tools,baleboy/crosswalk-app-tools,hgl888/crosswalk-app-tools,baleboy/crosswalk-app-tools,davidmaxwaterman/crosswalk-app-tools