raco: update submodule to master
Merge pull request #153 from uwescience/production

Merge from production
merge in raco example changes
examples: add iteration and sigma-clipping
Merge pull request #154 from uwescience/update-myrial-examples

Update visible MyriaL examples
svg-crowbar.js
update raco submodule
Add a simple join example
Move the visualization above the text representations of plans
Rename twitter join -> two hops
Merge pull request #155 from uwescience/domoritz-tiny-improvements

Domoritz tiny improvements
Merge branch 'master' into production
merge conflicts
remove demo3 examples from examples.py