Upgrades Gradle Wrapper to version 1.8.
Removes redundant specification in .gitignore file.
Merge pull request #176 from damonkohler/upgrade_gradle

Upgrades Gradle Wrapper to version 1.8.
Moves most attributes from AndroidManifest.xml into build.gradle.
Changes android_honeycomb_mr2 API level to 15. Less than 0.1% of devices run level 13.
Renames android_gingerbread_mr1 to android_10.
Renames android_honeycomb_mr2 to android_15.
Changes all Android projects under android_core to support both Eclipse and Android Studio.
Renames Camera to XYOrthographicCamera.
Fixes camera control gestures that stopped working after Honeycomb.
Adds Context argument to draw() method for OpenGlDrawables. This enables loading assets, etc.
Changes use of FrameName back to GraphName now that FrameTransformTree handles GraphNames in a tf2 compatible way.
Merge pull request #178 from damonkohler/master

New Android library naming scheme and bug fixes.
Merge pull request #181 from damonkohler/next_big_thing

Changes FrameName to GraphName to work with rosjava_core/master
Merge branch 'master' of https://github.com/rosjava/android_core into choose-network-iface

Conflicts solved in:
	android_10/src/org/ros/android/MasterChooser.java
	android_10/src/org/ros/android/NodeMainExecutorService.java
Move startMaster AsyncTask to NodeExecutorService

Also, merge this branch with master and solved small conflicts.
Fix some more style problems.