[modules/git] Nicer formatting of stati

Add separate widgets for each state, so that each state can have a
custom icon *and* a custom coloring.

themes/solarized-powerline.json

@@ -42,5 +42,10 @@
 			"fg": "#002b36",
 			"bg": "#859900"
 		}
-	}
+	},
+  "git": {
+	"modified": { "bg": "#2aa198" },
+	"deleted": { "bg": "#d33682" },
+	"new": { "bg": "#859900" }
+  }
 }