Revert "remove retina theme"

This reverts commit ca25f8e6.

@braver thought he could get off easy, but the massses have spoken!

repository/t.json

@@ -1554,6 +1554,17 @@
 				}
 			]
 		},
+		{
+			"name": "Theme - Retina",
+			"details": "https://github.com/braver/SublimeRetina",
+			"labels": ["theme"],
+			"releases": [
+				{
+					"sublime_text": ">3100",
+					"tags": true
+				}
+			]
+		},
 		{
 			"name": "Theme - Seti Monokai",
 			"details": "https://github.com/poucotm/Theme-SetiMonokai",