Bug 1013842 - Create gaia-menu Web Component [r=kgrandon]

This reverts commit 9fac6e9c3acff17ef21ba144733ccae6e0e905d2.

https://bugzilla.mozilla.org/show_bug.cgi?id=1013842

Seeing what this looks like on TBPL.

On gaia-try: https://tbpl.mozilla.org/?tree=Gaia-Try&showall=1&rev=3f5af2725229