Added basic support for CVS and Mercurial SCMs.

Browsing, changesets fetching and diff viewing are implemented.
Only tested with local repositories.

Thanks to Ralph Vater for CVS specific code.

git-svn-id: http://redmine.rubyforge.org/svn/trunk@559 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine.rb

@@ -1,3 +1,5 @@
 require 'redmine/version'
 require 'redmine/mime_type'
 require 'redmine/acts_as_watchable/init'
+
+REDMINE_SUPPORTED_SCM = %w( Subversion Mercurial Cvs )