Configure CI build for Commons and Rendering to not use the XWiki externals repo

[INFO] ------------------------------------------------------------------------
[INFO] Building XWiki Commons - Extension - Repository - XWiki 5.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[WARNING] The POM for org.restlet.jse:org.restlet.ext.jaxrs:jar:2.0.14 is missing, no dependency information available
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] XWiki Commons - Extension - Parent POM ............ SUCCESS [3.097s]
[INFO] XWiki Commons - Extension - API ................... SUCCESS [13.889s]
[INFO] XWiki Commons - Extension - Handler - Parent POM .. SUCCESS [0.349s]
[INFO] XWiki Commons - Extension - Handler - JAR ......... SUCCESS [4.899s]
[INFO] XWiki Commons - Extension - Repository - Parent POM  SUCCESS [0.475s]
[INFO] XWiki Commons - Extension - Repository - Maven .... SUCCESS [5.013s]
[INFO] XWiki Commons - Repository ........................ SUCCESS [0.395s]
[INFO] XWiki Commons - Repository - Model ................ SUCCESS [1.579s]
[INFO] XWiki Commons - Repository - API .................. SUCCESS [1.051s]
[INFO] XWiki Commons - Extension - Repository - XWiki .... FAILURE [0.040s]
[INFO] XWiki Commons - Groovy ............................ SKIPPED
[INFO] XWiki Commons - Management ........................ SKIPPED
[INFO] XWiki Commons - XML ............................... SKIPPED
[INFO] XWiki Commons - Velocity .......................... SKIPPED
[INFO] XWiki Commons - Diff .............................. SKIPPED
[INFO] XWiki Commons - Diff API .......................... SKIPPED
[INFO] XWiki Commons - Diff Display API .................. SKIPPED
[INFO] XWiki Commons - Diff Script API ................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 31.841s
[INFO] Finished at: Tue Apr 23 20:42:22 EEST 2013
[INFO] Final Memory: 37M/94M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal on project xwiki-commons-extension-repository-xwiki: Could not resolve dependencies for project org.xwiki.commons:xwiki-commons-extension-repository-xwiki:jar:5.1-SNAPSHOT: Failure to find org.restlet.jse:org.restlet.ext.jaxrs:jar:2.0.14 in http://repo.maven.apache.org/maven2 was cached in the local repository, resolution will not be reattempted until the update interval of central has elapsed or updates are forced -> [Help 1]