Added files.
Changed ModuleBase from an abc to a regular class

Also cleaned up inheritance in models.py and imports in __init__.py.
Removed debug message that was calling the discharge method of a module.
Implent __lt__ in Module.
Only return currentCap when stable.
Fixed linear cap model.
Fix typo in docstring.
Remove other math functions.
Added tests.
Updated gitignore with vim swap files.