Change OCL dependency to org.eclipse.ocl.examples (#188)

Before, the dependency to `org.eclipse.ocl.all.sdk` pulled all OCL
implementations, including the one for UML, which unnecessarily pulled
UML in the GEMOC Studio.

In addition, this dependency did not even bring to GEMOC the OCL
graphical editors.

Therefore, this commit replaces this dependency by
`org.eclipse.ocl.examples`, which includes graphical OCL editors,
and does not pull a dependency to UML.

Signed-off-by: Erwan Bousse <erwan.bousse@tuwien.ac.at>

gemoc_studio/releng/org.eclipse.gemoc.gemoc_studio.branding.feature/feature.xml

@@ -36,7 +36,7 @@ http://www.eclipse.org/legal/epl-v10.html
    <requires>
       <import feature="org.eclipse.xtext.sdk" version="2.5.4" match="greaterOrEqual"/>
       <import feature="org.eclipse.xtend.sdk" version="2.5.4" match="greaterOrEqual"/>
-      <import feature="org.eclipse.ocl.all.sdk" version="0.0.0" match="greaterOrEqual"/>
+      <import feature="org.eclipse.ocl.examples" version="0.0.0" match="greaterOrEqual"/>
       <import feature="org.eclipse.emf.ecoretools.sdk" version="2.0.0.0" match="greaterOrEqual"/>
       <import feature="org.eclipse.gemoc.modeldebugging.feature" version="0.0.0" match="greaterOrEqual"/>
       <import feature="org.eclipse.gemoc.modeldebugging.feature.source" version="0.0.0" match="greaterOrEqual"/>