Cleaned up code that parses and reports errors. Added check for property tag numbers to be greater than zero.

com.google.eclipse.protobuf.ui/plugin.xml

diff --git a/com.google.eclipse.protobuf.ui/plugin.xml b/com.google.eclipse.protobuf.ui/plugin.xml
index fd013cb..133a7c3 100644
--- a/com.google.eclipse.protobuf.ui/plugin.xml
+++ b/com.google.eclipse.protobuf.ui/plugin.xml
@@ -170,7 +170,7 @@
       class="com.google.eclipse.protobuf.ui.ProtobufExecutableExtensionFactory:com.google.eclipse.protobuf.ui.builder.ProtobufBuildParticipant">
     </participant>
   </extension>
-  <extension id="pbmarker" name="Protocol Buffer Marker" point="org.eclipse.core.resources.markers">
+  <extension id="protocMarker" name="%protoc.marker.name" point="org.eclipse.core.resources.markers">
     <super type="org.eclipse.core.resources.problemmarker">
     </super>
     <super type="org.eclipse.core.resources.textmarker">
@@ -178,7 +178,7 @@
     <persistent value="true">
     </persistent>
   </extension>
-
+  
   <!-- Rename Refactoring -->
   <extension point="org.eclipse.ui.handlers">
     <handler