Changed image sizes.
Subtree is now output as a tree.
Added a bit about working with denali trees.
Removed doc, going to re-subtree it.
Read doc tree in.
Added real python stuff.
Merge branch 'master' into subtree_doc
Added tree object docs.
Merge remote-tracking branch 'origin/master'
Merge branch 'subtree_doc'
Added documentation on read_selection.