Allow setting target temperature in floating point degrees F.
Fix some whitespace issues
Change the show command to display temps in F.
Merge branch 'master' of github.com:lrosenstein/pynest

Merged Larry's and my solutions together for printing the F temp in
the "show" command (his detection test was better, but I liked my
output better -- always show what nest.com sends back, but optionally
show the F temp).