Issue #2390903 by tregismoreira: Support for node revisions
Issue #2516816 by tedfordgif: Compliance with Drupal Coding standards
Issue #2482815 by rooby: toc.js should allow calling the attach behavior with different contexts
Issue #2849242 by gmaltoni: Coding Standards
- Fixed a small inconsistency with the enable toc field default value
- Fixed a harmless php warning
- Added feature to choose the destination of the TOC with a custom jquery selector
