Frontend/css framework

It is _experimental_ PR. This PR apply [concise framework](http://concisecss.com) to our web application.

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![screenshot 1](http://i.imgur.com/4tDbmWy.png)
![screenshot 2](http://i.imgur.com/mHJA289.png)
Yes, I think we need if we decide to vendor external libraries.  Also we can consider using Bower.