Add tutorial link in navbar of docs
Put links on doc index into columns
Add framework for example gallery
Add initial example scripts
Rearrange old .py files that were in examples/
Update example gallery code to show plotting function on hover
Add and tweak many example scripts
Let example scripts specify their thumbnail center
More examples, starting with a grid of 24
Add row of thumbnails to the index
Add reset_origin to api docs
Make sure doc building creates needed directories and ignore in git
Merge pull request #136 from mwaskom/better_docs

Add example gallery and reorganize doc homepage