Add python version selection UI

package.json

@@ -55,7 +55,7 @@
         "c9"
     ],
     "c9plugins": {
-        "c9.ide.language": "#482a102bea",
+        "c9.ide.language": "#0a1daf922c",
         "c9.ide.language.css": "#a649f2a710",
         "c9.ide.language.generic": "#77d43cfaf0",
         "c9.ide.language.html": "#0f4078c187",
@@ -90,7 +90,7 @@
         "c9.ide.imgeditor": "#612e75ef4f",
         "c9.ide.immediate": "#a962119bec",
         "c9.ide.installer": "#0fde9f0067",
-        "c9.ide.language.python": "#33ff958961",
+        "c9.ide.language.python": "#608b4ec069",
         "c9.ide.mount": "#b9a5a2d45c",
         "c9.ide.navigate": "#38ae100ea1",
         "c9.ide.newresource": "#981a408a7b",