API Standardization

[milt]

putting on the big furry hat

• All components should accept a :children key to add arbitrary stuff (poured into the element with into), and those with a single subcomponent should have :child additionally.
• All handler fn keys should end in -fn, this will also help distinguish them from reagent handler keys
• All class flag keys should match the part of the mdl class after the -- and end in ?, so mdl-badge--no-background becomes :no-background?