Fix compiler warning in EpwFile.cpp

openstudiocore/src/utilities/filetypes/EpwFile.cpp:209:10: warning:
      6 enumeration values not handled in switch: 'Year', 'Month',
'Day'...
      [-Wswitch]
  switch(field.value())
             ^
1 warning generated.
Add in removed switch cases
Merge pull request #1113 from NREL/Fix_compiler_warning

Fix compiler warning in EpwFile.cpp