Bump version to 0.2.9 (databricks#128)

Update version numbers from 0.2.8 to 0.2.9rc-0

updating readme (databricks#102)

[95] Properly adds the shapes of the tensors to the graph. (databrick…

…s#98)

* support for strings

* removing type tags, they do not work with scala 2.10

* removing type tags, they do not work with scala 2.10

* removing type tags, they do not work with scala 2.10

* revert scala changes

* revert scala changes

* revert scala changes

update readme