minor tweaks to Quantity tutorial
slight adjustment of wording
fix convert to use -n option correctly
Merge pull request #54 from eteq/quantity-tweaks

Tweaks to Quantity tutorial
add note about issues
font size and width
remove empty cell at end
added bit about mailing list
Merge pull request #55 from adrn/better-style

Tweaks a few style parameters
make name consistent with other FITS
change metadata to be under astropy-tutorials key
use new metadata key
add output files to ignore
fix link
sort on name of tutorial not path
override ipython default width
need to import numpy
make font 14pt instead
comment at top
blank out title because nbconvert still not doing the right thing