Amended some default styling/befavior

- cursorBlink is not default from now on
- added some custom behavior in the demo

src/xterm.css

@@ -40,4 +40,8 @@
     color: #fff;
     outline: none;
     font-family: courier-new, courier, monospace;
+}
+
+.terminal .terminal-cursor {
+    background-color: #fff;
 }

src/xterm.js

@@ -389,7 +389,7 @@ Terminal.defaults = {
   convertEol: false,
   termName: 'xterm',
   geometry: [80, 24],
-  cursorBlink: true,
+  cursorBlink: false,
   visualBell: false,
   popOnBell: false,
   scrollback: 1000,