Fixes for missing freelancer styles and duplicate scripts.

Below are some of the changes I made:
- Added startbootstrap dependency to bower.json
- Changed gulpfile.js to copy freelancer bootstrap.min.css instead
- Replaced original bootstrap.min.css with the one from freelancer template (via gulp command)
- Removed duplicate jquery and bootstrap scripts in index.html
- Removed duplicate jquery and bootstrap scripts from /js/ folder

**IMPORTANT:** After accepting the pull request and pulling it to your local repo, immediately run `bower install` so that it installs startbootstrap. If you don't do this first, the `gulp` command will throw an error saying it cannot find the specified file. Also, try to accept this pull request before making any changes to your repo so you don't get conflicts or lose anything.