Merge pull request #17 from gaillard/master

Add newTimestamp parameter and functionality to ackSend() and requeue(). Also add prefix check for indexes.
Add php 5.6 for travis (yay for alpha!).
Merge pull request #19 from nubs/php56

Add php 5.6 for travis (yay for alpha!).
Switch to PSR-4.
Merge pull request #20 from nubs/psr-4

Switch to PSR-4.
Add coverage-html to build
Enforce @covers

Add forceCoversAnnotation to phpunit.xml
Add @covers annotations to all tests
Add colors to phpunit.xml
Use PHPUnit 4
Merge pull request #22 from chadicus/master

Some housecleaning