Workaround for failing build on Ruby 1.8.7

See bundler/bundler#2784
Merge two before_install sections.
Updated outdated gems.
Merge pull request #346 from trema/feature/update_bundles

Updated outdated gems.
Speed up rspec and cucumber tests.
Merge pull request #348 from trema/feature/speedup_tests

Speed up rspec and cucumber tests.
Add @ruby tag to Ruby scenarios.
Merge pull request #350 from trema/feature/cucumber_tagging

Add @ruby tag to Ruby scenarios.