Modal dialogs support

1. Added initial modal dialog support for Edit category
2. Removed extra bootstrap framework files. Using minified version only
now.
3. Update application style sheet.
4. Refactored Category controller and moved edit category actions from
User controller
5. Added javascript injection file for modals.
Delete Category Modal updated
Pulled latest from Master Branch
Merge pull request #12 from rohitkandhal/master

Modal dialog support added