Creating day4 branch
Renaming helper file
Adding initial enum setup
Refactored server/cabinet tracking. Now cabinets track servers rather
than the other way around.
created a ServerStatus enum (as a separate class) and updated the Helper
Added fillCabinets(int numberOfCabinets,int serversPerCab) method to
TestDriver, incldues random error throwing at 1% and 5% of the time.

Added try/catch error throwing to nameSearch

Added enum to Server

New exception classes, CabinetSearchException,
CriticalFillCabinetsException, FillCabinetsException,
NameSearchException

New enum class, ServerStatus

Added changes.html