style(subheader): convert to return
style(subheader): store data on  property object instead of a bunch of  properties
fix(subheader): fix sticky effect
fix(subheader): use angular.bind instead of Function.prototype.bind
fix(subheader): use element.prop instead of jQuery scrollTop
style(subheader): fix else if newline brackets
style(subheader): fix bad comment
fix(subheader): use material-item-content in subheader demo
perf(subheader): switch to translate3d instead of top adjustments
style(subheader): switch to verbose var statements
test(sticky): add test scenarios. Tests to come