Add support for debug_token
Add correction to be the pull request

* Specify which access token to use with debug_token
* Try to make the tests compliant with live testing
:grant_type instead of :type and client_credentials instead of client_cred for get_app_access_token_info

Complying with Facebook documentation (https://developers.facebook.com/docs/howtos/login/login-as-app/), app login flow should use 'grant_type' (not 'type') parameter and should request 'client_credentials'
Support for Faraday with Typhoeus 0.5

See https://github.com/typhoeus/typhoeus/issues/226#issuecomment-9919517
Clean code generating a deprecation warning

should_not_receive can't be used with and_return
See https://github.com/rspec/rspec-mocks/issues/134
fix result == nil when no pictures are retrieved from Facebook
Merge branch 'typhoeus_compatibility' of git://github.com/Cyril-sf/koala into Cyril-sf-typhoeus_compatibility
Get test suite working with Typheous 0.5.4
Merge branch 'debug_token' of git://github.com/Cyril-sf/koala into debug_token
Merge branch 'Cyril-sf-typhoeus_compatibility' into debug_token
Merge branch 'integration' into debug_token
Merge branch 'fix-travis' into debug_token
Merge branch 'master' of github.com:arsduo/koala into debug_token
Fix specs
Merge branch 'master' of git://github.com/miv/koala into app-token
Fix tests
Merge branch 'should_not_receive_deprecation_warning' of git://github.com/Cyril-sf/koala into Cyril-sf-should_not_receive_deprecation_warning
Fix specs
Merge branch 'master' into app-token
Merge branch 'master' of git://github.com/ifeelgoods/koala into nil-array