Add expression_name back to QP cols results

Fix migration failures due to timeouts 

Fix non-admins w/ perms not able to create new collection in root 

Fix Mongo & Druid multiple ags of same type

Fix nested queries with JOINs 

Fail gracefully when migrating invalid BigQuery legacy SQL questions

Gracefully handle normalization of invalid queries 

Auto-bucket datetime fields in filter clauses

Add ability to copy a dashboard 

Fix QP include-current behavior for previous/next time intervals

Revert tree-shaking

Fix migration failures  [ci drivers]

Handle missing columns in MongoDB results :male-detective: [ci mongo]

Shave 10-20MB off uberjar size

Use supported java docker image

Fix unspecified PG database connection strings

This issue can occur if the `MB_DB_DBNAME` variable has not been
specified. The `:dbname` key has a nil value which causes Ring's
`form-encode` function to fail. This commit explicitly removes the
`:dbname` as it's extra anyway and will also remove map entries that
have a nil key or value before encoding it.