first working (maybe?) version of beam
fixed a few invalid reads
fixed memory leaks
memory bug fix
ldf working for searn
beam and ldf now working together
fixed beam bugs, got sequencespan working correctly, implemented bilou decoding
added todo list
added a bunch of searn tests
integrated john's changes
added oneofmany test
added missing files
minor edit to gd
moved cdbg to searn
Merge pull request #263 from hal3/master

working version of beam search (test time only), a bunch of memory/bug fixes, and new searn-related test cases