added ipython notebook with all figures
Solve #118 by removing reference to Factory.
Merge pull request #131 from ehsteve/code_updates

Update to ipython notebook
Merge pull request #132 from Cadair/i118_factory

Solve #118 by removing reference to Factory.
Merge pull request #133 from aringlis/submap_index

Clarified that submap cutout is done using data coordinates (Listing 1).