v0.8.0

Cleanup before tagging

v0.6.8

Bower updates

First Release to only support 0.4 and newer

Work towards #90

Implemented and test added. Will close with documentation on gh-pages
branch

v0.5.4

This is the last version of Vega.jl guaranteed to work with version 0.3 of Julia. Going forward, compat macros will be stripped out of code for cleanliness.