Merge pull request #114 from tregagnon/gh-pages

Popin animations for all modern browsers (not only Webkit and Gecko)
Fixing the doc and samples for the custom select component - fixes #115
Up arrow icon - fixes #113
Provide a how to guide on using Tetra UI - fixes #107
Tetra UI 1.2.6
In the documentation for helpers, fix links to the variables.less file.
Line numbers were no longer correct.