Migrated to new lein 2 test structure. Set *warn-on-reflection* explicitely

Migrated to new lein 2 test structure. 

```clojure
src/kits/stuff.clj          ; namespace to test
test/kits/test/stuff.clj    ; old style
test/kits/stuff_test.clj    ; new lein 2 style
```

Set *warn-on-reflection* true/false in all source files.

```clojure
(set *warn-on-reflection* true)    ; in source files
(set *warn-on-reflection* false)   ; in test files
```