Merge pull request #222 from thunlp/dev

Dev

Remove some disused images.

Merge pull request #209 from thunlp/dev

Merge pull request #209 from thunlp/dev

Merge pull request #203 from thunlp/dev

Dev

Merge pull request #118 from thunlp/dev

Dev

Version 1.1.0

- Added Dataset and DataInstance to manage dataset and sentences instead of a list of tuples.
- Modified "get_grad" interface definition.
- Added an example of adversarial training
- Updated documents, added PyPI installation.

first version