PIT CLI agenda sorting, FileIssue bug fixed.

* Fixed the bug in FileIssue where it would append a blank line to the body of
  an issue every time it wrote the issue to the file. Fixed by making the
  parser consume a line break before the property section.
* Fixed PIT CLI -D option sorting of issues so that it will sort issues by
  priority, then due date.

libpit/src/main/com/jdbernard/pit/file/IssuePegParser.java

@@ -27,8 +27,8 @@ public class IssuePegParser extends BaseParser<Object> {
 
     Rule PropertyBlock() {
         return Sequence(push(makeNode()),
-            HorizontalRule(), OneOrMore(EOL), TableSeparator(), EOL,
-            OneOrMore(PropertyDefinition()), TableSeparator(),
+            EOL, HorizontalRule(), OneOrMore(EOL), TableSeparator(),
+            EOL, OneOrMore(PropertyDefinition()), TableSeparator(),
             addToNode("extProperties", pop())); }
 
     Rule PropertyDefinition() {