docs(jqmOnceClass): un-document jqm-once-class; internal directive
feat(jqmButton): add jqm-button directive
feat(jqmPage): expose directive ctrl with .scroll() method
feat(jqmPopup): add jqmPopup directive
fix(jqmPopup): make scroll offset be correct
chore(): move to angular-widgets
chore(README): add docs at top and state of project