Mails can have bodies such as

!claim

taking this task

Or

!assign alincoln

please, take this task I took; its hard

This function parses such an email body and returns a dictionary containing a clean body text (e.g. "taking this task"), and a list of commands. For example, this body above might parse as:

array(
  'body' => 'please, take this task I took; it's hard',
  'commands' => array(
    array('assign', 'alincoln'),
  ),
)