added RabbitMQ and Redis checks
added redis/rabbitmq tests
adjusted tests and checks
added failure tests
updated readme
fix typo
remove author phpdoc tag
Merge pull request #39 from kbond/redis-rabbitmq-checks

Add RabbitMQ and Redis checks.
allow to send not only get requests
extended testcase
extended the readme
Merge pull request #41 from 0x46616c6b/guzzle-improve-requests

Improvement: allow to send not only get requests