Bumps version to v.0.1.3.
Adds note about get_key_words function not working.
Updates change log for v.0.1.3.
Releases v0.1.3.

* Fixes typo in docs. Fixes #4.
* Adds *license_code* argument to ``pynlpir.open``. Fixes #6.
* Packages NLPIR version 20131219 and removes version 20140324. Fixes a NLPIR expired license issue. Fixes #5.
* Fixes bug with double slashes in input. Fixes #7.

Merge branch 'release/v.0.1.3' into develop