fix path to CUDA libraries (use targets/armv7-linux-androideabi/lib)
save previous values of LOCAL_* variables and restore them at the end
Tests install path fix for Android SDK.
Merge pull request #2274 from jet47:android-mk-fix
update test CascadeClassifier
Merge pull request #2277 from asmorkalov:android_test_path_fix
project.properties file generation fixed for per-component installation.
Merge pull request #2288 from asmorkalov:android_project_properties_generation_fix
Absolute path to tests in opencv_run_app_tests.sh fixed.
Merge pull request #2285 from KonstantinMatskevich:ocl_test_cascade2.4
Merge pull request #2292 from asmorkalov:ocv_deb_tests_script_path_fix
Multiple improvements in OpenCV examples build.

EMBED_CUDA and FORCE_EMBED_OPENCV flags added to cmake macro add_android_project;
INSTALL_CUDA_LIBRARIES option added to OpenCV.mk
opencv_dynamicuda library installation with enabled OPENCV_INSTALL_MODULES flag fixed;
CUDA initialization apportunity added to OpenCVLoader.initDebug();
Tutorial-4-CUDA sample reimplemented with static OpenCV and CUDA initialization.
Merge pull request #2276 from asmorkalov:android_install_cuda