Removal dead code from my side :-)

Added Capistrano to the development group in Gemfile 

It should be README.rdoc fixes #4067

There's no need for Capistrano to be install on a server, the extra argument in the comment implies this now.

requiring enumerator is not nessessary in ruby 1.9

fix default_i18n_subject comment in ActionMailer::Base

handle not only strings in date type cast

add failing tests for issue #3487

There are a bunch of other implicit branches that adds
1.8.x specific code that still needs to be removed. Pull
requests for those cases are welcome.

Revert "Fixed some grammatical errors in raw_email_with_invalid_characters_in_content_type. Picky, I know."

This reverts commit 30aa4e6c.

Reason: docrails doesn't allow changing code. As much as this is a plain
text file, I would still like to enforce the policy strictly.

Add db/*.sqlite3-journal to .gitignore

These can pop up while the SQLite DB is being written to.

remove warnings about @variable_for_layout

don't encode an UTF-8 encoded template

This reverts commit ce0cf7d6.