Merge branch 'fork-svg' into 'master'

Compress fork SVG code

#### What does this MR do?
Cleans up fork SVG code using https://jakearchibald.github.io/svgomg/

![Screen_Shot_2016-09-03_at_9.17.40_AM](/uploads/7b27bda9493da3d2ee596dd20af9fc2f/Screen_Shot_2016-09-03_at_9.17.40_AM.png)

See merge request !6191

app/views/shared/icons/_icon_fork.svg

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