Rename LeaveAccount#grant to #credit and LeaveAccount#deduct to #debit
Merge pull request #11 from terenceponce/method_renaming

Rename LeaveAccount#grant to #credit and LeaveAccount#deduct to #debit
Add resque
Add letter_opener
Notify human resources when an employee files for a leave
Notify employee when their leave request is approved
Notify employee when their leave request is rejected
Notify employee when their leave request is marked as taken
Notify employee when leave credits have been granted to their account