Installed gems related to user interface

- boostrap sass
  - for Twitter Bootstrap integration
- HAML
  - Uses HAML instead of ERB
- simple_form
  - For easier/flexible HTML layouting

Signed-off-by: Joan Tiffany Siy <joan@teamcodeflux.com>
Initial configuration for simple_haml

Generated via:

   rails generate simple_form:install --bootstrap

Signed-off-by: Joan Tiffany Siy <joan@teamcodeflux.com>
Added bootstrap to application javascript and stylesheet

Signed-off-by: Joan Tiffany Siy <joan@teamcodeflux.com>