simple_form 2.0.0.rc improved api for twitter bootstrap

gistfile1.haml

-# Instead of this simple_form 2.0.0.rc Twitter Bootstrap complication:

= form.input :savings, :label => "Your Savings:", :input_html => {:class => 'span2'}, :wrapper => :prepend do
	%span.add-on= £
	= form.input_field :savings
	%p.help-block Enter the amount of money you have in your savings account

-# I'd like to do something like this (simpler)

= form.input :savings, :label => "Your Savings:", :class => 'span2', :prepend => '£', :hint => 'Enter the amount of money you have in your savings account'