1. more clear js,did a lot refractoring. 2. abstract get_kernel method
out for reuse. 3. add a full support for heatmap with contour. 4.
abstract the json interactive out, for reuse. 5. merge dvalcarce's
binary classify demo in. 6. add a mechanism for auto button code
generation. 7. fixed a bug which in clustering demo, when user click
left mouse button, the point are recorded in both feature sets, now it
works correctly.
Merge pull request #9 from foulwall/refractor

a lot of refractor.