more improvements to README
more improvements to README

djangonauts/django-hstore,Stranger6667/django-hstore,Stranger6667/django-hstore,Stranger6667/django-hstore,pombredanne/django-hstore,pombredanne/django-hstore,Stranger6667/django-hstore,djangonauts/django-hstore,pombredanne/django-hstore,djangonauts/django-hstore,djangonauts/django-hstore,pombredanne/django-hstore