add --pid_file command line option
Check pusher protocol version and ignore unrecognized/unsupported protocol versions
Rename the X-Pusher-Secret header to X-Pusher-Signature and supply the correct content type of 'application/json' on webhook requests.
Drop old Ruby support
update README
Merge pull request #143 from stevegraham/update-readme

update README
Merge pull request #140 from eploko/fix-signature-and-content-type-on-webhook-request

Webhook signature and content type fix for the pusher protocol version 2.2.2
Merge pull request #134 from loggator/protocol-check

Check client protocol version and ignore unrecognized/unsupported versions
resolve merge conflicts from luniki master. closes #95
Fix race

Only handle 'pusher:connection_established' in spec.
pusher_internal:subscription_succeeded gets there a too fast on Travis-CI
nawsing everything*

*technical term
Merge pull request #144 from stevegraham/fix-travis-race-condition

Fix Travis-CI Race condition