Fixed the font path in the demo html file

I moved the google icon and the cake icon to other locations that doesn't have the bidi-mirror feature.

Remove the icons that are not mirrored to regular locations. And moved the icons that need mirroring to mirrored locations. Replaced "octicon-chevron-right" with new set of mirrored icons from fontello

Based on issue #688 advice, used webfont-dl to download roboto font and
modified base stylesheet to reference roboto locally instead of
referencing Google hosted version.

Used webfont-dl with url
http://fonts.googleapis.com/css?family=Roboto:300,400,500,600,700&subset=latin,cyrillic-ext,greek-ext,greek,vietnamese,latin-ext,cyrillic
to download Roboto font to local directory.  Url originally declared in
base.less.

The url requestd 300,400,500,600, and 700, but it looks like only
300,400,500, and 700 are supported.

Proudly making the real initial commit! Congratulations to all involved: Diego Sampaio, Marcelo Schmidt, Rafael Caferati and Rodrigo Nascimento