rewriting searn
fixing some memory bugs, rewrote neighbor features
ldf seems to be working
fixed bug with neighbor features and stride stuff
cleanup
changed hook to be generic for python and c++, added searn example to library
moved searn library to separate header, fixed some memory leaks
bug fixes
removed TODOs, print numactions just so you can see it
pulled john's changes
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Merge pull request #400 from hal3/master

changed hook to be generic for python and c++, added searn example to library interface