GA sync fixes 

Stream all JSON responses [ci drivers]

Driver simplification part 1 [ci drivers]

Keep using --add-modules=java.xml.bind flag for SQLServer driver

Fix issue with joins in BigQuery driver

Add a deprecation warning for JDK 7

This commit switches from `ring.middleware.json/wrap-json-response` to
a new function that will stream JSON responses. Before this change the
full JSON response was serialized to a String first, then written to
the response stream. This change will skip that step and write the
response to a PipedOutputStream directly.

This is the same approach that was used in the response for the
`/database/:id/fields` route, just generalized and applied to all
routes.

Merge branch 'fix-bigquery-joins' of https://github.com/jvdweerthof/metabase into jvdweerthof-fix-bigquery-joins-3

Add new test util with-temp-db-vals macro; remove resolve-private-vars

trim user name before set

Use JodaTime to parse datetime strings

Dashboard Text Cards

Minor code cleanup 

Don't try to use inactive fields in queries

Fix wrong values in tooltips (#6401)

code cleanup!

Improve field sync performance

Improve `/database/:id/fields` response time

Previously the code would individually insert any new column found as
a row in the fields table. This commit switches that processing to be
chunked. This significantly increases performance of sync when there
are many new columns being sync'd (i.e. when adding a new database).