Remove test for mcrbm that had no tutorial and depended on pylearn

Moves the hmc code from mcrbm/ to hmc/
Merge pull request #23 from lisa-lab/remove_failing_mcrbm_test

Remove test for mcrbm that had no tutorial and depended on pylearn
Remove installation of pylearn, and equations for mcrbms
Remove warnings in doc generation
Merge pull request #24 from lisa-lab/remove_failing_mcrbm_test

Further clean-up after removing failing mcrbm test
Merge branch 'master' of https://github.com/lisa-lab/DeepLearningTutorials into rnn_lm
new commits