modified quantum to ready for QN2mode

See merge request !22

This really doesn't need to be a part of precompIFO

matplotlib: use hex color names instead of the cool xkcd ones
When matplotlib >= 2.0 is ubiquitous, we can revert this.
numpy: use np.flipud in place of np.flip
np.flip only exists in numpy >= 1.12, and flipud is clearer anyway.

(addresses #23)

Suspension type BQuad changes the bottom stage material to silicon.
Reverse the SUS stage list in suspensionthermal.py to use the appropriate Temp.
Addresses #23

This is a port of the changes added to matgwinc in
gwinc/matgwinc@a83e5053b64e6e8d3176f8fc29df631972fec451

The new pygwinc quantum curve diverges slightly from the matgwinc
version at the highest frequencies, for reasons that are not clear
to me...

e.g. ifo['Sub.Element']

newtonian noise calculation was fixed in both py and mat gwinc, so
update matgwinc calculation cache in tests.

this was just a typo

use consistent naming

(Gitlab wants it to be called CONTRIBUTING.md)

Implements the changes recommended by Jan Harms in https://git.ligo.org/rana-adhikari/CryogenicLIGO/issues/45
Fixes #18

Add better description about IO, and clarify some of the argument help.

Add ability to load a noise budget previously saved in an HDF5 file.

If an HDF5 file is passed to the --save option (indicated by '.hdf5' extension)
then save the data to an HDF5 file without plotting.

Functions to save/load noise traces and IFO model parameters to/from HDF5
files.  Requires the h5py module.

free up the "util" namespace for other purposes not related to noise
calculation

namespace conflict with the gwinc plot keyword argument.

automatic creation of the commad line interface script

So that distribution packages and tarballs don't misrepresent what the
project is.