Add route support to OpenShift explorer

Add support for viewing routes in OpenShiftExplorer and property pane

steps to verify:

1. ASSERT: have openshift origin cloned and available in your openshift server
2. EXEC: in openshift server, cd to <origin>/examples/sample-app and do:

   osc process -f application-template-custombuild.json | osc create -f - -n test

3. EXEC: once the build is finished: open up OpenShift explorer
4. ASSERT: you should see an entry: "OpenShift 3 Sample"
5. EXEC: unfold "OpenShift 3 Sample"
6. ASSERT: have a child entry "Routes" with an entry "route-edge"
7. ASSERT: make sure you have properties view opened
8. ASSERT: the properties view is displaying properties for the selected route "route-edge"