Added example for simple YSO model
Updated tutorial on setting the ISRF scaling correctly
Fixed link
Remove old TODO
Started refactoring tutorials
Moved scripts to subfolder
Make plotting tutorial standalone with its own model
Updated .gitignore to exclude models
Move writing SEDs to same page as plotting
Wrapping
Added missing files and refactored image tutorial
Refactored animation tutorial
Refactored quantity visualization tutorial
Removed obsolete files and updated index
Cleanup and added note to all models about dust file
More refactoring (pure scattering example and Class I example)
Moved a few files around
Removed unused variables
PEP8 and removed explicit number of processes
Added a section on making 3-color images