Rhbz1124630 - remove RESTEasy dependency from client

by switching to jersey as JAX-RS implementation, in fedora we could save users 200MB download.

Depend on zanata/zanata-parent#36

Not really depend on this but it's nice to have (especially in preparation for Fedora packaging) zanata/zanata-api#22
I follow your suggestion to rename the FakeServerRule into MockServerRule until later I realize there is already a MockServerRule in other module. I don't want to mess the nice git history so renamed the mockito one into... MockitoServerRule. I will do a rename (back to FakeServer?) after other fixes. The history should be easier to view then.