Added curve sampling function
Added .gitignore
Added missing __init__.py files
Add refactored functions for line and thick slicing
Top-level pv_slice
added WCS-based pv extraction along with robust cube shape checkign
added vector-based PV extraction
bugfixes and cleanup
refactor endpoints -> x,y
some more refactoring?
notebook updated
Merge pull request #6 from astrofrog/refactor-geometry

Refactor geometry
Merge pull request #5 from keflavich/master

Add WCS-based PV extraction
Refactor using Paths
Removed ``interpolation`` option, use ``order=0`` for nearest-neighbor interpolation
Small function name change
Renaming thick to poly
Tweaks to imports
Minor fixes
Improve description of Path class