Fixed width of "Phone" field

Realized that the field for the phone number was one character too small
and fixed it.

Signed-off-by: Sebastian Lenartowicz <slenarto@uoguelph.ca>
Added more error checking to register()

Added some checks for SQL injection and correct values to the register()
function.

Signed-off-by: Sebastian Lenartowicz <slenarto@uoguelph.ca>