Support --constant/-C <initial_constant_value> option
Add train-set and test-case for new --constant option
Merge branch 'master' of git://github.com/JohnLangford/vowpal_wabbit
Clean up to reduce coupling: move initial_constant stuff into gd.cc
Merge branch 'master' of git://github.com/JohnLangford/vowpal_wabbit
Merge pull request #212 from arielf/master

Support --constant/-C <initial_constant_value> option