[OGRE-144] Update the developer guide to use the newer mercurial eol extension.
[OGRE-144] Update the developer guide to use the newer mercurial eol extension.

--HG--
branch : v1-9

digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre