Add code from luminus template

Code was generated by running

$ lein new luminus boefie-invest +h2

copied over, currently broken due to version mismatches in jdbc /
korma libs
Indention changes.
Migrate to new clojure.java.jdbc api
Run all tests as part of the repl commands.

Extract a list of test namespaces to the system var and maintain them there.
Add test case for about route
Remove difftest dependency.

Difftest breaks, maybe caused by having humane-test-output enabled at
the same time. Removing it fixes the immediate issue.
Clean-up code base

Remove unused module boefie-invest.core.
Move boefie-invest.test.handler to boefie-invest.handler-test
Remove dependency on clojure.java.jdbc.deprecated

Port all functions to newer API
Cleanup indentation in bigmoney.clj and increase test coverage.