simplified labels as per Jiang's suggestion
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
factor cb parsing out of cb algorithms
version control cb_algs
bumped minor version number
more minor refactoring
Merge branch 'master' of github.com:JohnLangford/vowpal_wabbit
uniform explicit include guards
removed leading _ in constant.h
error check all calls to calloc
fixed Martin's nasty multiline parse bug
fix holdout loss
Merge pull request #265 from pierce1987/master

fix holdout loss
Add regression test (Test 60) for 'holdout got broken'
Merge pull request #266 from arielf/master

Add regression test (Test 60) for 'holdout got broken'
renamed local_update and initialized min_label
Merge pull request #267 from hal3/master

fixed crazy searn bug that made dagger not work very well unless alpha was tiny
error handling on failed file open
Merge branch 'master' of github.com:JohnLangford/vowpal_wabbit
propagate error correction to tests