fix bug with feature_mask header and options overriding header from initial_regressor
fixed snapshotting/history bug, added sequencespan task for searn
Merge branch 'master' of git://github.com/JohnLangford/vowpal_wabbit
fixed memory leak
fix minor bug with off by one error in max_examples tracking
Merge pull request #194 from hal3/master

fixed snapshotting/history bug, added sequencespan task for searn
Merge pull request #195 from agrubb/bugfix-max-examples

fix minor bug with off by one error in max_examples tracking
Merge pull request #193 from agrubb/bugfix-feature-mask-header

fix bug with feature_mask header and options
bugfix from Weizhu Chen