use flask-sqlalchemy's query_class to override query object
update setup.py to be built in python 3.3

At this time pip does not install Flask-WhooshAlchemy.  In order to install from git using `python setup.py install`, xreadlines must be removes.
Merge pull request #18 from originalsurfmex/patch-1

update setup.py to be built in python 3.3
Merge pull request #12 from miguelgrinberg/master

play nice with Flask-SqlAlchemy's query object
update release
Add support for custom analyzer
Merge branch 'master' of github.com:huxuan/Flask-WhooshAlchemy