Move labels out of fieldholder tpl so checkbox can be an exception
Override checkbox fieldholder anyway
Wrap submit in form-group
Fix checkbox display (bootstrap)
FEATURE: Allow prerender and add .fields() method

This allows for custom rendering.

TODO: Allow passing manipulated fields to render()
Drop inputID in favour of attr map

This lays the ground for manipulating fields before rendering.
ID is now part of formao.fields().fieldName.attr
instead of formao.fields().fieldName.inputID
BUGFIX: Types were coming back undefined