0.3.0

Change conv2d to match TF API (tensorflow#67)

* update the readme and npm package

* update readme

* change conv2d api to take padding same|valid

* Merge branch 'master' into conv

* move logic to math

* some progress

* Merge remote-tracking branch 'origin/master' into conv

* Migrate all conv-related ops

* rename conv2dTranspose to conv2dDerInput

* switch shader indexing from float to int

* revert graph_runner_test

* self review

* Merge remote-tracking branch 'origin/master' into conv

* merge with the branch int_indexing

* fix typos in shaders

* merge with master

* update pool ops

* remove commented out code

* simplify api

* added unit tests for conv/pool

* add doc

* Merge master into conv

Remove non-nullable "!" operator (tensorflow#60)

* Remove non-nullable "!" operator

* fix lint errors

increase the width of article container in the tutorial pages