Adapt to renamed junit bundle in Kepler

Kepler renamed org.junit4 to org.junit, make the dependency to
org.junit4 optional and add another optional dependencies to org.junit
to ensure that both Kepler and older Eclipse platform releases can be
used.

Change-Id: I539cd47dfecc0ecbfe69378843177e54ac49e192
Signed-off-by: Stefan Lay <stefan.lay@sap.com>
diff --git a/org.eclipse.example.calc.test/META-INF/MANIFEST.MF b/org.eclipse.example.calc.test/META-INF/MANIFEST.MF
index c42087d..a70536b 100644
--- a/org.eclipse.example.calc.test/META-INF/MANIFEST.MF
+++ b/org.eclipse.example.calc.test/META-INF/MANIFEST.MF
@@ -5,6 +5,7 @@
 Bundle-Version: 0.1.0.qualifier
 Fragment-Host: org.eclipse.example.calc;bundle-version="[0.1.0,0.2.0)"
 Bundle-RequiredExecutionEnvironment: JavaSE-1.6
-Require-Bundle: org.junit4;bundle-version="[4.3.0,5.0.0)"
+Require-Bundle: org.junit4;bundle-version="[4.3.0,5.0.0)";resolution:=optional,
+ org.junit;bundle-version="[4.3.0,5.0.0)";resolution:=optional
 Import-Package: org.eclipse.example.calc.internal;version="[0.1.0,0.2.0)"