Z-index fix and documentation

Fixed the z-index bug where notifications wouldn't display in front of
all other elements. Documented this in the respective files.
Version update
Non-logged in users and content fix and cleaning up code

Fixed users who aren't logged in not being able to see content. Cleaned
up code for task_shortcode.php and added documentation and readability
to the file.
Merge pull request #1 from EzioBallarin/master

Z-index and non-logged in user fixes