changed SGD to direct update in test-lstm2
changed SGD to direct update in test-lstm2

MichalBusta/clstm,tmbdev/clstm,amitdo/clstm,tmbdev/clstm,tmbdev/clstm,kba/clstm,amitdo/clstm,kba/clstm,MichalBusta/clstm,kba/clstm,MichalBusta/clstm,MichalBusta/clstm,amitdo/clstm,jbaiter/clstm,jbaiter/clstm,kba/clstm,tmbdev/clstm,jbaiter/clstm,amitdo/clstm,jbaiter/clstm