Suggestion: Remove annotation padding

[roberttdev]

I've been using DocumentCloud to highlight scientific documents, and we were struggling a bit when it came to highlighting multiple cells in a small table (even with zoom). There were 'dead zones' where the highlight cursor changed to the page grab cursor, near an existing annotation and in a small page-spanning row above it.

I was able to remove this issue by removing the 'padding: 3px' property from '.DV-annotation'. To help users trying to make similarly close highlights, this may be helpful to change.

[knowtheory]

Any interest in tossing us a pull request, so you get credit for the change? :)

[roberttdev]

Certainly! #41