Add memcache to travis.
Add memcache to travis.

akatsoulas/remo,mozilla/remo,mozilla/remo,flamingspaz/remo,akatsoulas/remo,tsmrachel/remo,Mte90/remo,Mte90/remo,Mte90/remo,flamingspaz/remo,Mte90/remo,mozilla/remo,flamingspaz/remo,flamingspaz/remo,akatsoulas/remo,tsmrachel/remo,tsmrachel/remo,akatsoulas/remo,mozilla/remo,tsmrachel/remo