Slightly larger checkboxes. WIP - Feedback requested.

Okay, so, this one is another one of those "let me know what you think and I'll work on it more" things. :stuck_out_tongue:

1. The checkboxes feel really small to me. I don't know if it's the new theme overall, or just the styled text inputs that are being used. So increased the size ever so slightly.
2. Should we clear the browser default styling and customize it to look more like the text inputs? i.e. white bg and black thin border?