Git Tag: Initial support for tagging

Branching in git even more useful if using tags. Simulate relase branches,
maintenance branches and so on is therefore really useful in this tool.

Now, rudimentary tagging is implemented, where tags can be attached to the
commits, and referenced by for exmapmle git checkout

Signed-off-by: Max Sikström <msikstrom@op5.com>

src/js/git/commands.js

@@ -557,6 +557,24 @@ var commandConfig = {
         destination: tracking
       });
     }
+  },
+  
+  tag: {
+	regex: /^git +tag($|\s)/,
+	execute: function(engine, command) {
+      var generalArgs = command.getGeneralArgs();
+      
+
+      if (generalArgs.length === 0) {
+        var tags = engine.getTags();
+        engine.printTags(tags);
+        return;
+      }
+      
+      command.twoArgsImpliedHead(generalArgs);
+      engine.tag(generalArgs[0], generalArgs[1]);
+
+	}
   }
 };