AndroidProject: Implement copying xwalk, jars and resources from app template
AndroidProject: Implement copying xwalk, jars and resources from app template

Also bump min API target, see
https://github.com/crosswalk-project/crosswalk-app-tools/issues/3

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