Abstract models access.

- Consolidate models into one module.
- Access them through module index.
- Remove deprecated shrinkwrap file.
Merge pull request #73 from sgunturi/abstract-models

Abstract models to their own module.
Limit find methods to only pull approved database entries.
Merge pull request #74 from sgunturi/limit-to-approved

Limit find methods to only pull approved database entries.
Miscellaneous updates.

- Rename routes/api.js to routes/bhajan.js.
- Update paths in app.js.
- Formatting & comments.
Merge pull request #75 from sgunturi/misc-updates

Miscellaneous updates.
Add API routes to return JSON data.

- Add routes for findOne, search, and findAll.
- Exclude _id field from returned search data.
Merge pull request #76 from sgunturi/add-api

Add API routes to return JSON data.
Bump to 0.7.4.