Use MongoClient instead of the Mongo class. This will only work for pecl/mongo >= 1.3.0
Removed the usage of the safe option
Added a dependency to pecl/mongo greater than or equal to 1.3.0
Make travis test php-5.5 as well
The mongo, memcached and apc extensions are pre-installed
Remove 5.5 for now
Moved pecl extensions to the suggests block as they are not strictly required
Merge pull request #136 from christeredvartsen/mongo-update

Use MongoClient instead of the Mongo class