Upgrade Travis to 2.7.11
Upgrade Travis to 2.7.11

pulilab/rapidpro,pulilab/rapidpro,tsotetsi/textily-web,ewheeler/rapidpro,pulilab/rapidpro,pulilab/rapidpro,tsotetsi/textily-web,ewheeler/rapidpro,tsotetsi/textily-web,ewheeler/rapidpro,tsotetsi/textily-web,ewheeler/rapidpro,tsotetsi/textily-web,pulilab/rapidpro