fix doc
Merge pull request #22 from alalek/fix_docs

(fix docs warnings)
fixed warnings
added samples to use retina in its basic form and for HDR tone mapping
Merge pull request #23 from ilya-lavrenov/warnings
fixed RGBD compile errs and warnings
Merge pull request #27 from vpisarev/rgbd_fixes
Merge pull request #21 from shahurik/adas

ADAS: training app, stumps and waldboost
fixed warnings
Merge pull request #31 from ilya-lavrenov/warn_fix
Extract imgcodecs module from highgui
Fix build errors
updated code formating of reina samples
More abstract tracker declaration

This contribution changes the way how trackers should be implemented by
programmer. It should be noted first, that from the user prospective,
Tracker::create() method still can be called with the same effect.
However, there's no more thing as a "constructor" for Tracker, they
should be created via static functions, e.g.
    static Ptr<TrackerMIL> createTracker(const TrackerMIL::Params &parameters=TrackerMIL::Params());

From the programmer's perspective now for every tracker what is declared
in tracker.hpp header is more a "interface", while the real
implementation class can (and has to) be implemented in .cpp file.

Changes in documentation are also included.
Merge pull request #30 from nailbiter/abstract

More abstract tracker declaration
Merge pull request #24 from albenoit/master

added samples to use retina in its basic form and for HDR tone mapping
Tracking-Learning-Detection and MedianFlow

This contribution includes the following logical components into
tracking module:

.) Change Rect to Rect2d into headers for Tracker's methods;
This contribution includes the following logical components into
tracking module:

.) Change Rect to Rect2d into headers for Tracker's methods;
.) MedianFlow tracker;
.) extensible benchmark to compare trackers interactively and
	assess them quantitatively;
.) TLD tracker (work-in-progress);

Work was funded by Google Summer of Code 2014 initiative. Mentors:
Gary
Bradski and Vadim Pisarevsky.
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