Bump api/hammer gems

Full pass on all 3 OSes:

    ii  ruby-foreman-api   0.1.11-1           Ruby bindings for Forman's rest API
    ii  ruby-hammer-cli    0.0.18-1           Universal command-line interface
    ii  ruby-hammer-cli-fo 0.0.18-1           Foreman commands for Hammer
    17 tests, 0 failures

@tstrachota care to review before I merge/build?