Adds table of contents and improved header display.

Add document headers from PR urvin-compliance#112 on the original pro…

…ject.

Fixes issue urvin-compliance#131 (img tag URL is resolved even when d…

…ata is provided)

Forgot the changelog.

Allow paths in file names; added save method to document instances; f…

…ixed issue with empty paragraphs following tables when they actually needed to be inserted in table cells sometimes.

Version bump to 1.3.0

Post merge housekeeping. Release v1.2.0

Added ability to change size of page number label and value. (h/t @cf…

…acello)

Version bump to 1.1.1