[gatein-dev] Modification to the build

As discussed earlier, now that the tests are run on all 'mvn install' it requires an additional parameter. While this is a constraint that will be removed in the future, currently one need to set: exo.projects.directory.src and the build enforce the existence of some directories. I changed it slightly (and about to commit) so that anyone who checkout: http://anonsvn.jboss.org/repos/gatein/portal/trunk doesn't have to create directories to match what was required. It means that *if you defined exo.projects.directory.src before you now need to change it to add /gatein/portal/trunk at the end*. Said differently, Maven was checking for the existence of: <file>${exo.projects.directory.src}/gatein/portal/trunk/web/portal/src/main/webapp</file> and is now checking for: <file>${exo.projects.directory.src}/web/portal/src/main/webapp</file> I've tested locally and it works just fine, I may not be aware of other use cases that require that parameter so please let me know if you face an issue. I've updated the readme. Thanks, Thomas.