Update to use latest tester and helpers.
Merge pull request #19 from Brightspace/nstonehouse/refactoring/tester-and-helpers

Update to use latest tester and helpers.
Updating LESS variable names and mixins for consistency.
Merge pull request #20 from Brightspace/dbatiste/consistency

Updating LESS variable names and mixins for consistency.
Upgrading to 0.1.2 of gradient which has a fix for IE9
Merge branch 'master' of https://github.com/Desire2Learn-Valence/valence-ui-button into upgrade-gradient-ie9fix

Conflicts:
	package.json
Explicitly using 0.1.0 of vui-karma-jasmine-tester as there was a breaking change 0.1.1
Merge pull request #21 from dlockhart/upgrade-gradient-ie9fix

Upgrading to 0.1.2 of gradient which has a fix for IE9