Added 2 more configuration options: position (meta box position: normal, side, advanced), priority (meta box priority: high, default, low, core).
Added styles when Attachments meta box is placed in side.
Merge branch 'side' of github.com:kasparsj/side
Modified the CSS a little bit to accommodate some hidden borders. Added a 'Toggle Fields' link to save on space.
Moved the toggle link within the thumbnail container to save even more room. Some further CSS refinements.
Updated documentation for new meta box positioning. Closes #30. Thank you @kasparsj!