converted necessary files for python3 compatibility using 2to3
fixed relative imports in Jinja for python3
explicit string encoding when writing to file in python3
Merged upstream master
Fix for bug #3599: cv::FileStorage does not work for std::vector of user-defined struct.
performance tests for ORB
WriteStructContext treats state of fs
Added test code for I/O of user-defined types.
added perf test for CalcBackProj
Merge branch 'master' of https://github.com/Itseez/opencv into back_proj_fix
FEATURES2D: add DenseFeatureDetector Python wrapper
UMat map-unmap synchronization test
changed type of sanity check
added jpeg progressive support.
Fixed stereoBM for Intel CPU.
Merge pull request #2378 from ngryman:progressive_jpeg
Merge pull request #2478 from clemenscorny:master
improved cv::filter2D
Merge pull request #2528 from mlyashko:back_proj_fix
Merge pull request #2529 from ilya-lavrenov:tapi_filter2D