myria-web: add support for pushing SQL to backend
add pushing SQL option to developer panel
upgrade raco to master with sql pushing support
travis: ignore sqlalchemy when running tests
myria_web_main: unify handling of boolean req params

Handle missing values better, in a nice unified way
Merge branch 'master' into add-sql-alchemy
Merge pull request #209 from uwescience/add-sql-alchemy

Add sql alchemy