update version to 0.2.3 (magenta#762)

Bump to 0.2 (magenta#729)

Add missing rtmidi pip dep and bump version. (magenta#720)

* Add missing RUN_DEMO script.

* Remove blank line

* Add missing pip dep and bump version.

Minor updates to AI Jam instructions. (magenta#718)

* Increment version number.

* Fix quantization error during generation.

* Add controls to README

* Remove extra space.

* Remove extra space.

Bump version to 0.1.13 (magenta#706)

Bump version to 0.1.12 (magenta#657)

Add pianoroll_rnn_nade model. (magenta#640)

* Add rnn-nade model.

* Updates for compatibility

* Limit the batch size based on the beam size and branch factor.

* lint

* Add support for _Layer and Layer depending on availability.

* Add support for _Layer and Layer depending on availability.

* Add README

* Respond to reviewer comments.

* Respond to reviewer comments.

* Rename rnn_nade to pianoroll_rnn_nade for clarity and consistency.

* Rename rnn_nade to pianoroll_rnn_nade for clarity and consistency.

* lint

* Rename rnn_nade to pianoroll_rnn_nade for clarity and consistency.

* Add support for state tuples in bundles.

* Lint

* Lint

* Add missing dep

* Flatten state tuples for collections.

* Simplifications.

* Simplify

* Lint

Prepare for 0.1.10 release (magenta#560)

* Bump version to 0.1.10.

Also switch autoinstaller script to install tensorflow as a part of the
pip depencencies for magenta, rather than downloading a specific .whl
file. Installing via pip is now the recommended installation method.

* Update README.md to install tensorflow via pip.

bump version to 0.1.9 (magenta#504)

bump to 0.1.8 (magenta#469)