Jhhalchemy

Fixed
- `__version__` corrected

Added
- time_order helper function for API wrappers

Added
- Logger for JHHAlchemy migration

Removed
- Use `enum.Enum` instead of `jhhalchemy.model.BaseTypes`

Added
- `jhhalchemy.migrate` module with functions to create database locks and to safely run [Alembic](http://alembic.zzzcomputing.com/) upgrades

Changed
- Moved tests to root directory so they won't be included in the package.

Changed
- Updated column definitions in Base and TimeOrder to correctly autogenerate alembic migrations