Updated readme.txt with desciption about different OCV Manager packages
hiding empty menu button on Android 4
Updated OpenCV Manager rst documentation
Explicitly use double precision sin & cos in hough implementation

On some platforms sin and cos are calculated in single precision resulting in
diversity of results.
Merge pull request #262 from kirill-kornyakov:minor-cleanings-for-android-sdk
Merge pull request #261 from apavlenko:samples_remove_empty_menu
Merge pull request #263 from taka-no-me:hough_explicit_double
Removed hack from perf test on HoughLines, since I hope it is fixed by pr263
Merge pull request #264 from kirill-kornyakov:remove-hack-from-hough-lines-perf-test
Improve function arguments parsing and checking

* always use "argN" names for unnamed arguments
* honor space symbol between typename and "*", "&" symbols
* fix indent errors
Fix discrepancies between function signatures in headers and documentation
Fixed a bunch of minor issues in 'dev_with_OCV_on_Android.rst'.
Fix race condition for Cascade Classifier when TBB enabled.
Changed parallel_for to parallel_for_ in haar.cpp
fixed CvBoost::predict
(Sometimes sample_data became bad because the buffer with its values was deallocated early).
Merge pull request #271 from 5kg:fix_cascade
Merge pull request #270 from wswld:2.4
Merge pull request #275 from mdim:bug_fix_cvboost
Fix build of java bindings on mingw
Fix build with libjpeg release 9