In progress [Issue 125] Support for custom options.

Code cleanup.
diff --git a/com.google.eclipse.protobuf/META-INF/MANIFEST.MF b/com.google.eclipse.protobuf/META-INF/MANIFEST.MF
index 21189b7..b1316ee 100644
--- a/com.google.eclipse.protobuf/META-INF/MANIFEST.MF
+++ b/com.google.eclipse.protobuf/META-INF/MANIFEST.MF
@@ -23,6 +23,8 @@
 Export-Package: com.google.eclipse.protobuf,

  com.google.eclipse.protobuf.conversion,

  com.google.eclipse.protobuf.grammar,

+ com.google.eclipse.protobuf.model,

+ com.google.eclipse.protobuf.model.util,

  com.google.eclipse.protobuf.parseTreeConstruction,

  com.google.eclipse.protobuf.parser.antlr,

  com.google.eclipse.protobuf.parser.antlr.internal,