Added a parts-based SVM example on MNIST.
Merge branch 'master' of github.com:amitgroup/amitgroup
Merge branch 'master' of github.com:amitgroup/amitgroup
Speed improvements to edge and part coding.

- Added support for stides in coding of parts.
- Now bedges uses bspread, which is much faster for orthogonal spreading.
- Added a function to code parts into feature vectors directly.