Better system for defining what content should be annotable

[afiore]

Currently the plugin includes the Annotator on the basis of a single URL pattern defined in the settings page. This is far from being a satisfactory solution, and is not fine grained and user friendly as it should be. On the contrary, It's practically impossible to come up with a regex that matches posts belonging to one or multiple tags or categories.

For instance, if the index page for the blog posts tagged 'bar' is accessible at the URL http://blogaddress/tags/bar, this will be matched by the regex: /\/tags\/bar\/.*$/. However, there is practically no way to define a regex for matching the single URLs of the posts tagged 'bar', as these are typically generated by combining only the date and title, and not their categories or tags .

Perhaps a better approach would be to devise an inclusion mechanism based only on two criteria.
The Annotator would be automatically included for:

• All blog posts belonging to the special category annotable
• All blog posts having the custom field annotable set to true.

Finally, the annotator will not be included if a blog post belongs to the annotable category but also has the annotable custom field set to false.