initialize TIMES variable with some default value (10)

These codes should be included into regular builds.

error in the tutorial Similarity check (PNSR and SSIM) on the GPU

Added to the tutorials the "Support Vector Machines for Non-Linearly Separable Data" contributed by Fernando Iglesias García. Corrected a mistake in the gpu-basics-similarity.rst file. 

Added the "Similarity check (PNSR and SSIM) on the GPU" tutorial. Corrected an highgui TOC tree mistake.