Merge pull request #38 from polpo/master

Add support for Sony Music Unlimited.
Updated to version 2.0.18
Added ability to toggle all site options on/off
Removed node_modules directory
Updated gitignore file
Added browserify main scripts
Updated dependencies
Updated build script to bundle js files using browserify
Updated build process, README, moved old scripts to modules directory
Loaded watch grunt task
Updated plugins and content script to use browserify
Removed old content scripts
Moved old scripts into browserify main files
Fixed bug in songza plugin
Fixed issue that caused icon to not display properly on popup
Removed Utils requirement from plugins that don't need it
Added support for Focus@Will (www.focusatwill.com)
Fixed compress build stage
Updated names of plugins to be more consistent
Options page should be more self-sufficient now