Add byebug to test dependencies
Create some form helpers:

- Move 'mixin' type modules to the mixins folder
- Create ng_* form helpers. e.g. ng_text_field :name
- these will automagically bind the field
Extract default args regex to a constant
Use Method#arity and Method#parameters to partially remove coupling from helper implementation
Move includes with Rails classes to main lib file
Create base class for FormBinder with Default and CheckBox subclasses
Object and attribute being passed together, so just get the attribute binding
Use reverse_merge to add ng-model in case it's already been defined
Remove white space :grin:
Fix specs and add setup for creating form helper feature spec
Revert behaviour to previous concrete methods rather than using a symbol
Partially test all helpers
Comment out additional helpers and add them to a TODO list
Merge branch 'form_builder_helpers'