Added walkProject to core. Updated classes to interface changes.

* Implemented `walkProject` on `com.jdbernard.pit.Project`
* Updated several classes to fit the new interfaces/abstract classes.
* Still not finished with XML issue repository code.

pit-cli/project.properties

@@ -1,8 +1,8 @@
-#Tue, 09 Aug 2011 17:21:28 -0500
+#Fri, 21 Oct 2011 16:19:53 -0500
 build.dir=build
 src.dir=src
 build.jar=pit-cli-${application.version}.${build.number}.jar
-build.number=7
+build.number=9
 expected.application.version=2.6.0
 lib.dir=lib
 release.dir=release