Added php7 to the travis build matrix

Merge pull request #9 from n1te1337/php7

PLATFORM-703: updated travis build to run under php7

0.3.0

Added Predis support

0.2.1

Makes pause return true if the queue is already paused

0.2.0

Stable release. The interface and failure behavior is very unlikely to change now.

0.1.0

This will be subject to changes as we integrate into one of our apps.