Added cv::flip using Transparent API
added cv::intergal to T-API
Enable GStreamer 1.x support by default.

GStreamer 1.x is universally available, and with 0.10 being deprecated,
there should be no reason to default to 0.10 stil.
fixed warnings
Merge pull request #1937 from ilya-lavrenov:tapi_integral
Merge pull request #1942 from ilya-lavrenov:warn_fix
Fixed test for ocl_flip
Merge pull request #1936 from ElenaGvozdeva:ocl_flip
Merge pull request #1941 from vhdirk:gst1x_default