Initial commit
Add phpunit.xml.dist
Update composer with correct details and version pinning
Update README with better usage example
Rename CreateRequestSubscriber to RequestSubscriber
Guzzle4 support
Import (Merged) Guzzle4 version of http-signatures from https://github.com/blocktrail/http-signatures-guzzle/tree/guzzle4
Merge pull request #1 from blocktrail/master

Import (Merged) Guzzle4 version of http-signatures from blocktrail:guzzle4