allow mock mailer to work correctly on PHP 5.3 - we need to use call_user_func() instead of $callback()

git-svn-id: https://openclerk.googlecode.com/svn/trunk@1313 b12a1112-ca08-e5dd-f792-535eff3abf3b
issue #268: when running `grunt test`, save the reports to JUnit XML as well for CI server

git-svn-id: https://openclerk.googlecode.com/svn/trunk@1314 b12a1112-ca08-e5dd-f792-535eff3abf3b
issue #268: update INSTALL.md with Jenkins steps

git-svn-id: https://openclerk.googlecode.com/svn/trunk@1315 b12a1112-ca08-e5dd-f792-535eff3abf3b