Add full page title function.

- Added a title function in application_helper that creates a title given a page title, or else passes a default title.
- In "Home," removed the "Home" page title and made it the default.
- Updated unit tests.
Added layout based on Bootstrap

- Added bootstrap framework
- Added rails logo
- Added partials for header, footer, and IE shim
- Added a custom CSS and added some custom styling rules
Improve the custom stylesheet
Change basic routes to named routes
Finish layout, add user pages, add user integration tests