Run multiple mongo db versions and extensions in the travis build.
Run multiple mongo db versions and extensions in the travis build.

Removed a couple php versions to keep the number of runs down.

nubs/mongo-queue-php,dominionenterprises/mongo-queue-php,daniel-sc/mongo-queue-php,chadicus/mongo-queue-php,nubs/mongo-queue-php,daniel-sc/mongo-queue-php,chadicus/mongo-queue-php,dominionenterprises/mongo-queue-php