Updating to PSR-4
Adding composer self-update, and fixing tests (no autoloader
Removing --dev arg
Merge branch 'master' of github.com:keenlabs/KeenClient-PHP into psr4

* 'master' of github.com:keenlabs/KeenClient-PHP:
  Dropping default value for __call
Merge branch 'psr4' of github.com:aequasi/KeenClient-PHP into aequasi-psr4