In progress: [ Issue 40 ] Add support for import resolution across multiple folders
https://code.google.com/p/protobuf-dt/issues/detail?id=40

Adding support for using both workspace and file system paths for resolution of imports.
diff --git a/com.google.eclipse.protobuf.ui/META-INF/MANIFEST.MF b/com.google.eclipse.protobuf.ui/META-INF/MANIFEST.MF
index ad89cad..87abba7 100644
--- a/com.google.eclipse.protobuf.ui/META-INF/MANIFEST.MF
+++ b/com.google.eclipse.protobuf.ui/META-INF/MANIFEST.MF
@@ -16,7 +16,8 @@
  org.eclipse.core.runtime,

  com.ibm.icu,

  org.eclipse.emf.databinding,

- org.eclipse.core.resources

+ org.eclipse.core.resources,

+ org.eclipse.core.filesystem;bundle-version="1.3.100"

 Import-Package: org.apache.log4j,

  org.apache.commons.logging

 Bundle-RequiredExecutionEnvironment: J2SE-1.5