Gravity Forms functionality

- Models for forms, form meta, leads, and lead detail
- Relationships between all of these
- to_csv function for forms
Code for generating models for each Gravity Form

If you had a form called "User Registration", then, this would given you
a model called WPDB::GravityForms::UserRegistration that was filterable
(so you could call `.where(:date_registered => '2013-01-01')`) and where
each field in the form was mapped to an accessor. So, if your form had
"first name", "last name", and "email" fields, you could call for
example:

	WPDB::GravityForms::UserRegistration.where(:active => 0).each do |lead|
		puts "#{lead.first_name} #{lead.last_name} (#{lead.email})"
	end
Explain GravityForms functionality in README
Merge pull request #2 from robmiller/gravity-forms

GravityForms modelling