[fix #48160213] downgrade bunny gem to 0.8 version

The 0.9.x version had a bug which used 100% CPU.
0.8.0 is the latest stabile bunny gem.
Merge pull request #164 from ke4/48160213_downgrade_bunny_gem_to_the_latest_stabil_version__0_8_0__

[fix #48160213] downgrade bunny gem to 0.8 version
[#48401173] Fix joint when using the label filter for searching a labellable resource
[#48401173] Add specs for searching a labellable resource
[#48401173] Bump version
[#48401173] Refactoring
[#48401173] Gemfile.lock
Fix require for travis
Fix require for Travis
Merge pull request #169 from llh1/48401173_fix_search_for_labellables

48401173 fix search for labellables