Code editor tabbing and Pretty Print tabbing are inconsistent

[dqnykamp]

The built in tabbing for <codeEditor> is 2 spaces, but the tabbing for Pretty Print is 4 spaces. So, if I type <graph>{enter}<line />{enter}</graph>, the result is formatted with 2 spaces as

<graph>
  <line />
</graph>

Subsequently clicking Pretty Print, reformats to 4 spaces as

<graph>
    <line />
</graph>

Also, pressing tab in the <codeEditor> adds 2 spaces, consistent with it autoformat behavior.

[siefkenj]

Sure. I can change it to 2 spaces by default (even though I think 4 is much easier to read...)

[siefkenj]

Fixed in #24