decrease input size for several gpu tests to fix "timed out" error:

* BruteForceNonLocalMeans
* OpticalFlowBM
Fixed Cl.exe hang for VS2008 x64 with Eigen::exp() function
Merge pull request #2309 from Nerei:fixed_cl_exe_hang_with_eigen
Merge pull request #2308 from jet47:gpu-tests-timeout
typo
Merge pull request #2314 from ilya-lavrenov:typo
Workaround a LLVM/Clang 3.3 bug.

The LLVM/Clang 3.3 has a bug when compile a cl kernel with
assignment of a scalar to a vector data type. This patch
could work around this bug.

Signed-off-by: Zhigang Gong <zhigang.gong@intel.com>
LICENSE and README files installation rules added.
opencv_run_all_tests.sh implemented for Android SDK.
Merge pull request #2321 from asmorkalov:android_run_all_tests
Merge pull request #2320 from asmorkalov:ocv_readme_license_install
Merge pull request #2318 from gongzg:2.4
Application pause/resume fix for Android sample NativeActivity.
increase epsilon for AlphaComp sanity test for integer input
temporary disable perf test for StereoBeliefPropagation
Merge pull request #2331 from asmorkalov:android_native_activity_finish
Dead code removed as this cannot be null in Java.
Merge pull request #2332 from jet47:gpu-fixes
Merge pull request #2333 from asmorkalov:java_dead_code_fix