add ccn datastream, need to modify autoread
modified some of the axis labels on the plots to include units. update autodetect to work a bit better. update ccn file.
finished up ccn for now
added a skew-t plotting method in extras. updated the sounding class to utilize this new method. there's also an example that will plot.
getting very close to finishing up this skew-t thing
something is not right with the soundings and the potential temperature calculation. need to do some more checks before pushing to master.
skew-t finally ready for deployment: