Some how when installing you cant uninstall the module and keep everything running. What happens
is that the install file is loaded and gives a error. It want to load hook_field_schema and
references the AddThis class. There fore we do a include_once for the class in AddThis.php.

http://drupal.org/node/628486#comment-4987614

The markup is now create through a seperate hook function. This is more
dynamic and creates the possiblity to add the theme function better.

Todo: we need to test settings for a formatter and add a field instance to
the block. Settings need to be generic and also be able to be set on the
theme function.

My initial ideas about drupal was working where not right. Drupal
does create nice class attributes for tags based on a array. And I
split the wrapper element and the simple element.

Changed the addthis:title attribute value generation to use site name instead of drupal_get_title(), as the latter does not include the site name.

Added a description to Facebook settings fieldset to make users aware of the required Open Graph meta tags.

Removed redundant classes. Also removed author information, as there will probably be multiple contributors and keeping this up to date is not a top priority.

Matthias Glastra authored Sep 09, 2011 and Jani Palsamäki committed Sep 09, 2011

Merged code contributed by Matthias Glastra. Instead of re-inventing the wheel when generating AddThis configuration options, let's just use drupal_encode_json.

Committing contributed code by Matthias Glastra: Mostly coding conventions related modifications and renaming to prevent possible name collisions.

- Minor updates to README.txt

Fixed AddThis javascript configuration settings generation for boolean values. Previously the result was like: value: '1', now the result is correctly like this: value: true

- Using field formatters to select the sharing widget type in the UI (contributed by Matthias Glastra, matglas86, http://drupal.org/user/573464)

- Decided not to use instance level settings as having one type of sharing widget per entity instance type is more logical in most cases
  - There might be some special cases where you actually need to have a different type of widget for entities of the same type, but currently we try to keep this as simple as possible

Moved AddThis configuration generation to a separate class. Replaced some NULL-checks with empty-call where appropriate. Enabled co-brand message configuration.

Minor refactoring. Added type-hinting. Removed unnecessary UI field descriptions. Removed unnecessary methods. Using large toolbox icons as default.