Fix the problem of haar caused by merge
fixed Bug #3143 - flann 'not implemented' error
added add_definitions(-DCVAPI_EXPORTS) to cmakelists.txt
Merge pull request #1198 from znah:py_flann_fix
Merge pull request #1204 from berak:Bug_3170
Merge pull request #1164 from bitwangyaoyao:master_fixHaar