Adding inline styles (temporary) and DOM hooks for game and gamespace.

Will make it easier to add custom styles once we have an interface for it; and makes everything look a bit neater by default for now.
New styles for default game/gamespace

- Style images as backgrounds rather than elements
- Default larger text
Various admin interface improvements

- Launch game in popup sized to game size
- Show bigger room thumbnails in sidebar
- Remove Exits/Assets tabs
- Move Exits block to image template
- Various minor class changes
- Various minor text changes
- Adding background-image field to text rooms
- Adding thumbnail field to text rooms
- Removing client block (previously commented out, but we really don't need it)
Merge branch 'master' of github.com:bentobx/iV