modified highgui and ts modules and cmakelists for ios cross-compiling, added ios toolchains, added ios build tutorial

Added the "How to write a tutorial for OpenCV?" tutorial. Made some corrections to the feature2D TOC tree. Small visual improvements for the video-write.rst file. Deleted a definition file that served no purpose.

Added the tutorial "Using OpenCV Android binary package to compile applications, which use OpenCV from native level".

Added Fernandos first tutorial regarding SVMs. Extended the global links (conf.py). Corrected the author names. Minor modification to the dft tutorial. 

Sample files for image scanning, basic Mat, file I/O. Added Victors removed tutorials back in the system. Some typo fixing.Expanded conf.py with new global links.

Reformatted the TOC tables in tutorials to look just as good in PDFs as in HTML. Updated the default.css_t too for this. Added the "Windows Install" tutorial (with videos). 

Some reST syntax correction. Now the PDF documentation builds correctly under Windows using MIKTEX. Some update on the tutorial structure. Some CSS syntax correction. Windows Install Tutorial v0.4. 

New structure (following the documentation) for the tutorials. Normalized image sizes for TOC display.