Added 3 runtime dependencies: fastercsv, nokogiri, safe_yaml
Renamed Drupal modules to match versions
Remove unnecessary backslash in posterous importer.
Include importers into helper so each test file doesn't have to require individually.
Jekyll module ~> JekyllImport module
Jekyll ~> JekyllImport in Wordpress importer test
Renamed test files to follow new 'Importer' naming convention.