Install gems for front end development

The following gems will be installed:
- coffeescript
- jquery
- jquery-ui
- sass
- jbuilder

Theses gems will be helpful when developing the
views and for JSON APIs

Signed-off-by: Joan Tiffany Siy <joan@teamcodeflux.com>
Implement search method in Category

The search method will query the codes and names of
all the categories based on the given search keys.

This will be used later on for the autocomplete field.

Signed-off-by: Joan Tiffany Siy <joan@teamcodeflux.com>
Implement breadcrumbs method in Category

This method will return the ancestor path of
the category marked by a `>` symbol

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