renderables
renderable list builders
use add_rendered, detached
warn if this is wrong
fix context tests
Merge branch 'master' into renderables
fix create standalone context
more context tests
rename run to eval
expose run_in_context
add cross-context tests
allow evaling functions
consistency
fix render
fix handle_renderable
use add_renderable
remove render context function
eliminate render
make run contexts themselves renderable
don't allow output inside of renderables