Added Bootstrap & jquery UI

Currently it supports the following libraries:

• jquery: jQuery from github
• NEW jquery_ui: jQuery UI from their website
• NEW bootstrap: bootstrapJavascript helper functions for pygal from their website
• fomantic_ui: Fomantic-UI from github (fork of semantic UI)
• semantic_ui: Semantic-UI from github
• masonry: Masonry from github
• pygal_js: pygal.js pygal from github