Removed strict dependency to GEF.

plugins/org.yakindu.sct.examples.wizard/META-INF/MANIFEST.MF

@@ -13,9 +13,8 @@ Require-Bundle: org.eclipse.core.runtime,
  org.eclipse.osgi,
  com.google.gson,
  org.eclipse.jgit,
- com.google.inject;bundle-version="3.0.0",
- org.eclipse.gef;bundle-version="3.10.1",
- com.google.guava;bundle-version="15.0.0",
+ com.google.inject,
+ com.google.guava,
  org.yakindu.sct.ui.editor
 Bundle-RequiredExecutionEnvironment: JavaSE-1.7
 Bundle-ActivationPolicy: lazy