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
The field is only internal to the class itself. The class has the word Glossary in it. I am trying to make it shorter to write. In cases where the Command class has more than one client, the variable names will be more specific.