Eager load SimpleFrom using the Rails API

Closes #478
These modules don't need to be autoloaded

Conflicts:
	lib/simple_form/form_builder.rb
Fix the notification room
Oops! Ruby 1.8 :cry:
Added syntax highlighting for README.md
Merge pull request #737 from parndt/patch-1

Added syntax highlighting for README.md
[ci skip]
Merge pull request #723 from plataformatec/rails_3_eager_load

Backport eager load to support Rails 3
Use MRI 1.8.7 instead of REE on Travis.
Update CHANGELOG for v2.1.
Merge branch 'master' into rails_4

Conflicts:
	.travis.yml
	lib/simple_form.rb
	lib/simple_form/form_builder.rb