Turn test project into a feature

This allows package-private access in OSGi. The tests can now be
executed as plugin tests (tycho-surefire).
diff --git a/tests/org.eclipse.rap.nebula.widgets.grid.test/META-INF/MANIFEST.MF b/tests/org.eclipse.rap.nebula.widgets.grid.test/META-INF/MANIFEST.MF
index 7562355..f1acb8a 100644
--- a/tests/org.eclipse.rap.nebula.widgets.grid.test/META-INF/MANIFEST.MF
+++ b/tests/org.eclipse.rap.nebula.widgets.grid.test/META-INF/MANIFEST.MF
@@ -4,10 +4,8 @@
 Bundle-Vendor: %Bundle-Vendor
 Bundle-SymbolicName: org.eclipse.rap.nebula.widgets.grid.test
 Bundle-Version: 0.1.0.qualifier
-Require-Bundle: org.junit;bundle-version="3.8.2",
- org.mockito.mockito-all;bundle-version="1.9.5",
- org.eclipse.rap.rwt;bundle-version="[2.2.0,3.0.0)",
- org.eclipse.rap.nebula.widgets.grid;bundle-version="0.1.0"
+Require-Bundle: org.junit;bundle-version="4.8.2",
+ org.mockito.mockito-all;bundle-version="1.9.5"
 Bundle-Localization: plugin
 Bundle-RequiredExecutionEnvironment: J2SE-1.5
 Import-Package: javax.servlet;version="[2.6.0,3.0.0)",
@@ -21,3 +19,4 @@
  org.eclipse.nebula.widgets.grid.internal.gridcolumnkit;x-internal:=true,
  org.eclipse.nebula.widgets.grid.internal.griditemkit;x-internal:=true,
  org.eclipse.nebula.widgets.grid.internal.gridkit;x-internal:=true
+Fragment-Host: org.eclipse.rap.nebula.widgets.grid