Added sidebar-hero template
Improved the module structure of the helpers
Alter html_emails.rb so that the methods used after page has been rendered are no longer class methods. This had been necessary as the instance of the HtmlEmails object was not accessible inside the block (self no longer referred to the instance). I have also made the other (decomposed) methods private. This is a first step towards refactoring the majority of these methods out into the appropriate classes or modules
Refactor grid helpers to no longer directly reference HtmlEmails, as this was not the right place to put the Zurb specific code
Rearrange the use of the ink_boilerplate helper. It is no longer in the layout - this is so the user can select a background image for the email body, which would not be possible if this helper was in the layout
The ColumnSizes module needs to be included in the zurb ink module