Switches Travis to Trusty (14.04) beta
Switches Travis to Trusty (14.04) beta

since it's too complicated to just get Java 8 running on Precise (12.04)

HazyResearch/snorkel,HazyResearch/snorkel,jasontlam/snorkel,jasontlam/snorkel,jasontlam/snorkel,HazyResearch/snorkel