Fix test_* rebar tasks in 0.8:
Fix test_* rebar tasks in 0.8:

starting mimetypes app in boss.erl->ensure_started(mimetypes):
 - For tests rebar-tasks, adding adding deps/*/ebin to code load
   don't work on boss.erl->ensure_started(mimetypes)

Was broken since https://github.com/evanmiller/ChicagoBoss/commit/3169166406fae1bab9a7fb5c9363c9f8615b9944#L0R22

campanja/ChicagoBoss,danikp/ChicagoBoss,yunkai/ChicagoBoss,danikp/ChicagoBoss,frkarl/ChicagoBoss,solatis/ChicagoBoss,uselessd/ChicagoBoss,synlay/ChicagoBoss,7i11/ChicagoBoss,frkarl/ChicagoBoss,ChicagoBoss/ChicagoBoss,lamptt/ChicagoBoss,lamptt/ChicagoBoss,7i11/ChicagoBoss,aherranz/ChicagoBoss,powermedia/ChicagoBoss,ChicagoBoss/ChicagoBoss,powermedia/ChicagoBoss,aherranz/ChicagoBoss,solatis/ChicagoBoss,yunkai/ChicagoBoss,synlay/ChicagoBoss,uselessd/ChicagoBoss