Tidied up temp plot, commented out superfluous ones, added grid.arrange

Commented out superfluous plots.

Fixed y axis label for the temperature plot, including use of
expression(paste("Temperature "* degree, "C"))

Fixed X axis label for the temp plot, using the trick from the last
commit (same as used in the precip plot)

added grid.arrange

TODO: change legend location in plot.o (temp)