Changes made to tracked-task-uploaded email in order to display the type of task in the body
removal of the TaskType DAO and replaced with a switch statement to select task types from the enum contained in the task object
Add support for Real User names when sending reference emails

If the user has set their real name and made it available (by setting
receive_credit to true) then use that instead of their display name
when sending a reference email. If it isn't set or they don't want to
receive credit then fall back to their display name. Closes #33