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.

libpit/project.properties

@@ -1,9 +1,10 @@
+#Fri, 21 Oct 2011 16:18:33 -0500
 #Sat Apr 24 17:08:00 CDT 2010
 build.dir=build
 src.dir=src
 lib.shared.dir=../shared-libs
 test.dir=test
-build.number=1
+build.number=11
 expected.application.version=2.6.0
 lib.dir=lib
 release.dir=release