metabase.driver.mongo.util namespaces

generic SQL will share it.
Add Mongo lib dependency

add middleware functions which find and extract the http header for our metabase api key and make it available on the ring request as well as middleware that validates the apikey value and returns a 403 if it fails to match.

move the unit testing log4j.properties out the 'test' code folder because then it's also used in a lot of other places.  instead just create a new test_resources folder which we only apply to the unit tests profile.

* add some jvm args to our expectations profile so that it runs in a more isolated environment

request if you pass an HTTP body. So don't do that for `GET`

move initialization work into an 'init' function and call it from our '-main' function.  also setup lein ring to run our init function as part of its :init process.