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.
Fix reading of 16-bit TIFF images on big endian host.

Use correct integer types for arguments to TIFFGetField to avoid corruption
of values and failed loads of TIFF file when using cv::imread().

Added test where both big and little endian TIFF files are read using imread().

Fixed build of 3rdparty libtiff on big endian hosts.

Reduced memory required during decode_tile16384x16384 test by not converting
large grayscale test image to color image during read.
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
Fix Windows build of grfmt_tiff.cpp by using libtiff's integer types.
enabled OpenGL on MacOSX
Merge pull request #2318 from gongzg:2.4
Fix cmake detection of build platform endianness

Improve comments to indicate actual usage of WORDS_BIGENDIAN where
it is tested with #ifdef rather than #if
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