change default smtp subject
add indexes
rename db.py to model.py and update all invocation to ansiblereport.model
add tests for ansible-report
add make test target
add createdb.py utility
updates to setup.py
updates for rhel6 rpm requires
Updates to init_db_session in model.py

Provide some integration with alembic so that db is stamped with current
version.  Totally optional.