fixed deg comment
2nd iteration with changes based on Alex' comments.

objects.py:
    * renamed nautDir and nautLatLon to nautical_dir and nautical_latlon
      respectively
    * removed modulo for latitude in LatLon constructor
rtefcst.py
    * hasattr(), getattr() instead of __dict__
    * getCurPosFcst will now handle fcst['latitude'].data sorted in
      either ascending or descending order
    * all speeds in m/s internally; currently checks if uwnd. vwnd
      variables in fcst have unit knot and converts is necessary
test_rtefcst.py
    * added test for new exception InvalidInFileFmt in rtefcst.py