bump version to 0.1.9 (magenta#504)

bump to 0.1.8 (magenta#469)

Bump version to 0.1.7. (magenta#465)

Also update tensorflow dependency to 0.12.0rc1.

Bump version to 0.1.6 (magenta#370)

increment magenta version to 0.1.5 (magenta#333)

Merge RNN models. (magenta#272)

* Upgrade mido to 1.1.17

* Move encoder/decoders

* Merge melody RNNs.

* Re-add moved files.

* Move melodyencoderdecoders to own file.

* Move melodyencoderdecoders to own file.

* Update sequene generator and magenta_midi to work with merged model.

* Update docs.

* update pip build rules

* Add back 'KeyMelodyEncoderDecoder'

* Add copyright.

* Fix lint errors.

* Fix lint errors.

* Fix visibility.

* Fix internal deps.

* Fix lint errors.

* Bug fixes.

* Fix typo

* don't process bundle file path when None

* Remove bazel from melody_rnn README.

* Push version.

Bump version to 0.1.3 (magenta#270)

Cut a new release prior to announcing the pip package.

bump version to 0.1.2 (magenta#262)