add an uninstall task that specifies a device id to handle multiple connected devices
use custom install task named 'push' instead of relying on android gradle plugin's install task
rename install task from 'push' to 'installDevice'
Merge branch 'master' into uninstall_task
register 'uninstallDevice' task with the plugin
update readme
Merge pull request #7 from novoda/uninstall_task

add an uninstall task