Updated chat styles to be easier to read.

Conflicts:
	app/assets/stylesheets/chat_area/_activity.sass
Updated styles for search input and chat textarea, more polished.
Fixed tab float issue when multiple channel tabs.
Updated chat styles with less padding, more compact and easier to scan.

Conflicts:
	app/assets/stylesheets/chat_area/_activity.sass
Fixed alignment of connect/disconnect messages on small screens.
Align small emoticons to middle of line.
Max height on embedded images with hover to zoom, so images don't take up entire window.
Fixed specificity for connect/disconnect font color.
Merge pull request #352 from alfajango/updated-styles

Updated styles