- Added Gain control
- Changed default acquisition mode to grayscale
- Fixed a signed/unsigned compare issue
- Implemented frame resizing
- Implemented automatic buffer resizing on frame resize
- Corrected camera initialization so that it attempts to put the camera in Mono8
  but does not fail if this doesn't succeed.

Conflicts:
	android/service/engine/AndroidManifest.xml - use file from 2.4
	modules/contrib/src/detection_based_tracker.cpp - move #include <pthread.h> as in 2.4
	modules/java/android_test/src/org/opencv/test/OpenCVTestRunner.java - use file from 2.4

- Adding Android SDK/ADT r21 compatibility;
- fixing stl headers path for new ndk;
- fixing native API level for Android projects

Libinfo revision formating fix;
HW dependent VersionCode for Manager implemented.

OpenCV testing via OpenCV Manager implemented.

This reverts commit 7e301c5c, reversing
changes made to b5e009eb.

Merge pull requests #136, #142, #150, #152 from asmorkalov/new_framework_tutorial, asmorkalov/fd_package_fix, asmorkalov/java_test_fix and asmorkalov/engine_build_fix