Proper homepage.
These are handled by appraisals file.
Setup Appraisals file with proper gem requirements.
Don't use MODEL_ADAPTER, conditionally check if adapter is defined.
The module adapters are conditionally loaded if the proper pre-reqs are included in the project. Thus, we don't need to load each individually using an ENV variable. We can also test multiple adapters in the same project at the same time.
Update gem spec with more modern configs.
Fix whitespace.