Fixed undetected bug in FeatureTypeIII where the x coordinate is substituted with w
Added function VecFeature to calculate a certain feature types matlab way (matrix multiplication)
Added function VecAllFeatures to compute matrix of column vector correspond to the all possible features
Added VecComputeFeature function to compute all certain feature types on a number of integral images, which is only 1 line of code in matlab
Added function LoadSaveImData to load a number of images and then save their integral images into a file