refs #48: added a test showing that val=0 should not add the style
refs #48: val=0 no longer adds a style
refs #48: update note
Merge branch 'master' into issue_48

Conflicts:
	CHANGELOG
refs #48: refactor
Merge pull request #48 from OpenScienceFramework/issue_48

If a style has a val of 0, it still gets styled