Preparing for next development iteration, 0.8.1.
Updated information on using grape-roar for Hypermedia types.
Replaced rbx-2 with rbx-2.2.10.
Fix: mutually_exclusive and exactly_one_of validation error messages now label parameters as strings, consistently with requires and optional.
Add JSON output to Grape::Exceptions::ValidationErrors.
Merge pull request #687 from dblock/consistently-label-errors

Fix: mutually_exclusive and exactly_one_of validation error messages now label parameters as strings, consistently with requires and optional.
Added at_least_one_of parameter validator.
Set status for Endpoints when an error occours like #697
Merge pull request #698 from dspaeth-faber/set_endpoint_status_for_errors

Set status for endpoints when an error occours
added a spec and documentation for default status codes
Merge pull request #701 from dspaeth-faber/document_status

added a spec and documentation for default status codes
Merge pull request #692 from dblock/at-least-one-of

Added at_least_one_of parameter validator.
Updated rspec testing for Rails in README
Merge pull request #695 from serv/readme-rspec-test

Updated rspec testing for Rails in README
refactored auth middleware
Merge pull request #703 from dspaeth-faber/probosal_for_auth_middelware_refactoring

Make auth middleware extendable
added instruction for removed authentication middleware
Merge pull request #709 from dspaeth-faber/update_upgrading_md

added instruction for removed authentication middleware to upgrading.md
[config] moving project to rspec 3
Merge pull request #710 from apaganobeleno/config-changing-to-rspec-3

[config] moving project to rspec 3