Add connection manager for avoid duplicate register and remove duplicate hstore extension creation.
Add note on README.rst about now hstore extension is not installed automatically
Add hstore extension install instructions to .travis.yml
Fix wrong parameter to connect.
Remove unnecesary code from connection manager.
Remove commented and now not necesary code.
Fixed typo on README.rst
hints to fix weird bug on drop-hstore-autoinstall
models.py cleanup
raised VERSION to 1.2.1 alpha
minor cleanups
Merge pull request #16 from djangonauts/drop-hstore-autoinstall

Improved hstore registration process: no more automatic "CREATE EXTENSION hstore"