Move gists stylesheet to themes

themes/Atom - Dark/gists.css

@@ -0,0 +1,35 @@
+.gist-notification {
+  position: absolute;
+  top: 6px;
+  left: 50%;
+  margin-left: -5%;
+  z-index: 99;
+  padding-left: 5px;
+  padding-right: 10px;
+  -webkit-box-shadow: 0px 0px 5px 5px #222;
+  color: #BBB;
+  background-color: #333;
+}
+
+.gist-notification .message-area {
+  float: right;
+  padding-top: 11px;
+}
+
+.gist-notification .message {
+  font-size: 13px;
+}
+
+.gist-notification .clipboard {
+  font-size: 11px;
+}
+
+.gist-notification:before {
+  font-family: 'Octicons Regular';
+  font-size: 32px;
+  width: 32px;
+  height: 32px;
+  margin-right: 5px;
+  -webkit-font-smoothing: antialiased;
+  content: "\f08c";
+}