format uptime to day hour min
Use Markdown syntax instead of HTML.

Also touch up README.
Remove IE note; implicit in "modern browsers".

IE9+ are considered modern browsers, and although you can't run the
dashboard on Windows nothing prevents you from accessing the page using
IE.
Merge pull request #79 from commonquail/readme

Simplify readme
Merge pull request #77 from arnaudbey/master

format uptime to day hour min
removed CDN URLs; added locally
Merge remote-tracking branch 'upstream/master'

Conflicts:
	css/font-awesome.css
	css/font-awesome/css/archive/font-awesome.css
	drop-dash-ui/src/main/resources/res/css/font-awesome.css