Add homepage link, fixes #56

Also changes resize handler icon
Add MIT license, fixes #58
Add autoprefixer, fixes #54
Fix flickering on initial opening of menu, ref #40

Upon hard refresh, this will still wait for images to load, but that is
expected (all images on the page will do it). This fixes the flickering
that happens even after the images are cached.
Fix resizing losing scroll bar

This would happen when opening menu, resizing, closing, then reopening.
The scroll bar would be gone. My best guess for why occurred is a timing
issue from when it ran in `populateEmotesMenu` to the time it ran during
the reopening of the menu. Also moved adding the classes during resize
after the resizing is finished; it will reduce some lag during resize,
as well as make it more apparent at the end of resizing that it becomes
pinned (resize then tack it there).
Add version number and developer install...

...instructions to the readme. Closes #57
Change readme links to referenced links
Add note to readme about autoprefixer
Allow forcing an emote to be shown

Set `emote.hidden` to `false` to force it to be shown.
Implement browserify
Remove positioning hack and change where menu...

...button is inserted. Fixes #63.
Float the menu button to match other Twitch buttons
Version bump v0.6.4