Updating the Dawn notebook

[oleg-alexandrov]

The Dawn notebook at

https://github.com/USGS-Astrogeology/knoten/blob/master/examples/dawn_fc_isis_cmp.ipynb

needs to be updated to ISIS 6, latest ALE and USGSCSM, and then the line:

usgscsm_str = ale.loads(fileName, props={'kernels': kernels}, formatter='usgscsm', verbose=False)

needs to be replaced with:

usgscsm_str = ale.loads(fileName, props={'kernels': kernels}, formatter='ale', verbose=False)

[amystamile-usgs]

PR #133 closes this issue.