fixed minor bugs

git-svn-id: http://word2vec.googlecode.com/svn/trunk@39 c84ef02e-58a5-4c83-e53e-41fc32d635eb
added script for training big word vector model using public corpora

git-svn-id: http://word2vec.googlecode.com/svn/trunk@40 c84ef02e-58a5-4c83-e53e-41fc32d635eb