+mobingteam addition of registration of tag (#25)
+mobingteam registering and using multiple tags (#25)
+mobingteam compact registration syntax (#25)
Merge branch 'master' of https://github.com/thoughtworks/pacto into issue25

Conflicts:
	lib/pacto.rb
	spec/unit/pacto/pacto_spec.rb
+mobinteam use default tag contracts
+mobing stubing multiple services journey test
Merge branch 'master' of https://github.com/thoughtworks/pacto into issue25
these files weren't staged
Update README for tag support [ci_skip]
Create Logger class for Pacto (#20)

Logger class is just a wrapper around built in ruby logger. This way we
can replace the logger library on the future (if needed)
Use Pacto::Logger on erb_preprocessor
Configure the logger thru Pacto::Configuration
+raquelguimaraes removed unused parameter, set registered contracts to empty instead of nil when unregistering
+mobing refactor based on comments on #25
Merge branch 'master' of github.com:thoughtworks/pacto into issue25

Conflicts:
	README.md
	lib/pacto.rb
	spec/unit/pacto/pacto_spec.rb
+mobbing rubocopped
eliminate the evil incarnate (returning nil)
readme updates for jesus's comments
allow register_contract with no tags specified (use :default), update readme
Merge pull request #25 from thoughtworks/issue25

Pacto tag support

@jesusmercado - i think we covered all your open questions.  if we forgot to explain something let me know.