ruby bindings: inital commit

### ffi ruby bindings for OpenCV (ruby, jruby, ...)

#### Binding process:
header files --> hdr_parser --> ruby code generator --> c code + ruby scripts (ffi integration)

#### Dependencies
compile time : ruby, python, g++ compiler
runtime: libopencv, ruby gem ffi
 
#### Ruby Example (more examples can be found in the test folder):

	require 'opencv'
	require 'pp'

	include OpenCV

	points1 = std::Vector.new(cv::Point2f)
	points2 = std::Vector.new(cv::Point2f)

	points1.push_back(cv::Point2f.new(1,1))
	points1.push_back(cv::Point2f.new(3,1))
	points1.push_back(cv::Point2f.new(4,2))
	points1.push_back(cv::Point2f.new(10,1))

	points1.each do |pt|
    		points2.push_back(pt*0.2)
	end
	pp cv::find_homography(points1,points2)


#### Notes:
* The source code is around for about a year (http://www.ropencv.aduda.eu/, https://github.com/D-Alex/ropencv)
* In principle the c layer is compatible to other languages like Haskell
* There is a ruby API for accessing objects being wrapped (https://github.com/D-Alex/rbind)

        puts rbind.cv.randShuffle.cname
        puts rbind.cv.randShuffle.csignature
        rbind.cv.randShuffle.parameter(2).remove_const!
        rbind.ml.StatModel.getParams.ignore = true

* the hdr_parser could be replaced by other parser like clang (prototype is included)