Added support for custom document converter.
 The converter is invoked at the end of the HTML transformation step.
Added support for custom document converter.
 The converter is invoked at the end of the HTML transformation step.
Cleaned the test spec.
Merge branch 'temp'
Removed the duplicate tests
Removed an extra line in the test spec to adhere to the formatting convention.
Changed the name of the rails configuration property roadie.custom_converter to  roadie.after_inlining
Changed the name of the method Roadie.custom_converter to   Roadie.after_inlining_handler
Added readme for the new property
Added two new scopes for inliner ( mailer, mailer method)
Added readme for inliner scopes
Introduced a new group for testing the inliner setting
Fixed the readme formatting

Changed H2 to H3
Updated the change log
Fixed a bug in the sample code included in the readme
Sign the changelog with the author of the enhancement
Change the examples codes in the README to be more exemplary
Merge branch 'custom-inliners'