Add enyo.Anchor kind for making <a> tags, also add alt property to enyo.Image.js

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #378 from enyojs/anchor-and-image

Add enyo.Anchor kind for making <a> tags, also add alt property to enyo....

Reviewed-By: Cole Davis (cole.davis@lge.com)