Test driver 1.3.7 and PHP 5.5 in Travis
Test driver 1.3.7 and PHP 5.5 in Travis

Also improve fetching of dependencies (source is more reliable than archives).

bjori/mongodb,lyft/mongodb,talkspirit/mongodb,taohaolong/mongodb-1,doctrine/mongodb,socialcdetest/test,researchgate/mongodb,alcaeus/mongodb,solocommand/mongodb