Normalized Worker.email to lowercase.
Fixed: Time Sheet form is not displaying
(https://trello.com/c/H2o7Qg41).  
Note: If a worker's email is stored in mixed case, it will need to be
normalized to lowercase in the DataStore.
Normalized `Worker.email` to lowercase.
Fixed: Time Sheet form is not displaying
(https://trello.com/c/H2o7Qg41).  
Note: If a worker's email is stored in mixed case, it will need to be
normalized to lowercase in the DataStore.