Merge pull request #10 from pingpong-labs/develop

Develop
Merge pull request #11 from pingpong-labs/develop

Develop
TODO : add streaming feature, update branch alias
Erreur for upload method

Instead of postStatusesUpdateWithMedia we have postSpostStatusesUpdateWithMedia so we've got Call to undefined method Pingpong\Twitter\Twitter::postSpostStatusesUpdateWithMedia()
Merge pull request #12 from AlexLombry/patch-1

Erreur for upload method
Updated license
Fix #13