scenedirector's gesture control methods
    onTap
    onDoubleTap
    onPan
    onPinch
handleGestures method to interface platform gestures with sceneDirector's gesture handler methods
Added gesture recognizers to the view:
    tap
    doubleTap (as tap with 2 tap set)
    pan
    pinch
A enum class to define different gestures handled by the application
1. Renamed TangramRenderer to be more generic as Tangram
2. JNI function for handling gestures
MainActivity:
    Note: This now includes a support library (android.support.v4.view.GestureDetectorCompat), which requires to be
    linked using android update lib-project. (TODO: should be handled by android cmake build system)
    1. now holds instances of GestureDetectorCompat and ScaleGestureDetector
    2. overrides onTouchEvent to pass MotionEvents to both the gestureDetector instances before these events can be
    handled in the default implementations of the system.
renamed to Tangram.java
Note: This now includes a support library (android.support.v4.view.GestureDetectorCompat), which requires to be linked
using android update lib-project. (TODO: should be handled by android cmake build system)

1. Renamed TangramRenderer to Tangram, which now also implements GestureDetector.OnGestureListener and
ScaleGestureDetector.OnScaleGestureListener interfaces along with the GLSurfaceView.Renderer interface

2. Implementation for the following (OnGestureListener):
    - onDown
    - onSingleTapConfirmed
    - onDoubleTap
    - onScroll (for panning, NOTE: use VelocityTracker class to get velocity instead of calculating the movement
    velocity)

    No OP methods from OnGestureListener:
    - onFling
    - onLongPress
    - onShowPress
    - onSingleTapPress

3. Implementation for the following (OnScaleGestureListener):
    - onScaleBegin
    - onScale
    - onScaleEnd
Inclusion of support library (android.support.v4.view.GestureDetectorCompat).
NOTE: Build system needs handle building and handling of these extern android libraries using the following:
    android update lib-project --path libs/src --target android-19
1. Fixed panning y direction issue
2. Naive way of handling zoom-in and zoom-out
new line
1. Naive handling of zooming
2. adds a static const max zoom level
3. Implements a incZoom functionality
log message for debugging
Pinch Zoom Updates:
1. Both ios and android handles discrete zoom (pinch gestures is only handled once when it ends).
More qork is required for continous zooming, at which point pinch gesture will be handled multiple times during a
gesture
comments...
Remove unused library source files
Removed.

Now handled by makefile and copied at build time.
Gesture Bug Resolved

There was a bug where only scale gesture was being recognized. Should be fixed now.
Added build rule for android extras support library

Now, the support library for GestureDetectorCompat found under (${ANDROID_SDK}/extras/android/support/v4) will be copied
at build time and used for building tangram android project.
Reverting Makefile changes

So it seems we do not need to copy and link the android extra support library.
However I updated the clean-android rule in makefile to not delete the jar file included with the project