quickly corrected the previous refactoring of features2d: moved from set(SOME_PROP, val) to setSomeProp(val)

In this particular case t shadows transpose of the base class Matx:
types.hpp:1805:14: warning: declaration of ‘t’ shadows a member of
'this' [-Wshadow]

Changelog gcc 4.8: The option -Wshadow no longer warns if a declaration
shadows a function declaration.

This warning is problematic because it prevents the module
opencv_contrib/modules/ruby to pass the build process

Merge branch 'refactor_features2d_take4' of https://github.com/vpisarev/opencv into refactor_features2d_take4

Conflicts:
	modules/features2d/src/orb.cpp

OpenCV with the refactored features2d compiles! contrib is broken for now; the tests are not tried yet