Fixes column and row text after the heatmap has been filtered.  This includes transitions for column text and removal of both column/row text on exit
Adds test for heatmap bug.  Still passes on master because the transitions don't load the new text right away.  Possibly need a wait?
Fixes heatmap tests.  d3 is reusing the text on the charts and we are looking for the remove case
artifacts
2.0 alpha
artifacts; update stock fixture
2.0 alpha.2

artifacts match tags
update module.exports for browserify compatability
Merge pull request #675 from triggity/master

update module.exports for browserify compatability