Basic browserify refactoring

Browserified version of 9gag plugin

Browserified Instagram plugin

Browserified ImgurPage plugin

Browserified Flickr plugin

Use jQuery ajax for Flickr

Browserified Opengraph plugin

Browserified MimeType plugin

Browserified Webpage plugin

Use gulp

Add watch

Return an object instead of a string

Cleanup
Cleanup unused files
Make ImageResolver works in Node.js
Reorganize files
Cleanup node example
Fixes browser feed example
Only use superagent for HTTP requests
Fixes examples
Update FileExtension plugin
Add test for MimeType plugin
Update FileExtension plugin tests
Add tests for NineGag and OpenGraph
Imgur Page plugin: support https
Add test for ImgurPage plugin
Add tests for Flickr
Fixes Flickr, add tests
Fixes relative url in Opengraph plugin
Fixes Webpage plugin, add tests
Fixes OpenGraph plugin
Update FileExtension tests