add mercurial info to website

doc/site/src/index.page

@@ -7,7 +7,7 @@ sort_info: 1
 
 Cerberus is a lightweight and easy-to-use Continuous Builder software for Ruby. It could be run periodically from a scheduler and check if application tests are broken. In case of failed tests Cerberus sends notification to developers.
 
-Cerberus works perfectly both on Windows and \*nix platforms and supports popular version control systems like Subversion, Git, Darcs and Perforce. It also has many ways in publishing build results such as e-mail, jabber, [Twitter](http://twitter.com), [Campfire](http://www.campfirenow.com), IRC and RSS files.
+Cerberus works perfectly both on Windows and \*nix platforms and supports popular version control systems like Subversion, Git, Mercurial, Bazaar, Darcs and Perforce. It also has many ways in publishing build results such as e-mail, jabber, [Twitter](http://twitter.com), [Campfire](http://www.campfirenow.com), IRC and RSS files.
 
 Cerberus requires:
 
@@ -18,6 +18,7 @@ Optional requirements:
 * [rake](http://rubyforge.org/projects/rake) - 0.7 or higher
 * [subversion](http://subversion.tigris.org/)
 * [git](http://git.or.cz)
+* [mercurial](http://mercurial.selenic.com/)
 * [bazaar](http://bazaar-vcs.org/)
 * [darcs](http://darcs.net/) client - 1.0.7 or higher
 * [bjam](http://www.boost.org/tools/build/v2/index.html)