working android gradle plugin build.
ignore android studio files.
catkinized, with local maven aar installs.
kazuto's fixes - inheritable ros activity and view handling so that camera view and visualization views can swap successfully.
use publishToMavenLocal task as that syncs with maven-publish later.
check if we are finishing already (this usually gets triggered from inside onDestroy() and avoid duplicating the finish call.
avoid confusion with qrcode and zeroconf scans.
android gradle plugin 0.5.0
Merge pull request #163 from rosjava/gradle_catkinization

Gradle Android Plugin & Catkinization
Hydro now uses tf2_msgs but with the legacy format (i.e. tf2_msgs/TFMessage instead of tf/tfMessage).
Merge pull request #164 from rosjava/tf2_msgs

Hydro now uses tf2_msgs with legacy format tf2_msgs/TFMessage
Commented configuration for testing with a turtlebot.
Work with upgraded frame names compatible to hydro's tf2 infrastructure.
Merge pull request #165 from rosjava/tf2_frames

Work with upgraded naming scheme for tf2 in hydro
dummy assemble tasks to stop android studio's latest upgrades from complaining on make requests.
Merge pull request #166 from rosjava/doc_dummy_targets

Dummy assemble tasks to comply with android studio's gradle compilations
    Re-enabling build of hokuyo driver and hokuyo tutorial
Updated hokuyo module to new location in rosjava_extras
project properties not used in the new adt.
bugfix the maven dependency name for the hokuyo jar.