Implemented [JACKSON-360], handling of "" as null for Joda types

diff --git a/build-test.xml b/build-test.xml
index 8fde4e9..8fee78b 100644
--- a/build-test.xml
+++ b/build-test.xml
@@ -54,6 +54,7 @@
             source="1.5" target="1.5"
             debug="true"
         >
+            <exclude name="org/codehaus/jackson/map/ext/*.java" />
             <exclude name="org/codehaus/jackson/map/interop/*.java" />
             <include name="**/*.java" />
             <classpath>
@@ -73,6 +74,7 @@
             source="1.5" target="1.5"
             debug="true"
         >
+            <include name="org/codehaus/jackson/map/ext/*.java" />
             <include name="org/codehaus/jackson/map/interop/*.java" />
             <classpath>
                 <pathelement path="${dir.build.classes.core}"/>
@@ -105,6 +107,7 @@
                     <exclude name="**/*$*.class"/>
                     <!-- and also interop tests, run later on -->
                     <exclude name="org/codehaus/jackson/jaxrs/*.class"/>
+                    <exclude name="org/codehaus/jackson/map/ext/Test*.class"/>
                     <exclude name="org/codehaus/jackson/map/interop/Test*.class"/>
                     <exclude name="org/codehaus/jackson/version/*.class"/>
                     <include name="**/Test*.class"/>
@@ -129,6 +132,7 @@
             <batchtest fork="no" todir="${dir.test.xmlresults}">
                 <fileset dir="${dir.test.classes}">
                     <exclude name="**/*$*.class"/>
+                    <include name="org/codehaus/jackson/map/ext/Test*.class"/>
                     <!-- 25-Nov-2009, tatu: Argh. Looks like classloading
                         is problematic for this test; works when run
                         separately as single test... but not in sequence