Bundle only the required database gems and adds sqlserver support (#12713).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11194 e93f8b46-1217-0410-a6f0-8f06a7374b81
Underscores are allowed in project identifiers (#9225).

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@11195 e93f8b46-1217-0410-a6f0-8f06a7374b81