Add travis build status
Add travis build status

ProctorU/letter_opener_web,sergey-verevkin/letter_opener_web,ProctorU/letter_opener_web,fgrehm/letter_opener_web,fgrehm/letter_opener_web,sergey-verevkin/letter_opener_web,fgrehm/letter_opener_web,fgrehm/letter_opener_web,ProctorU/letter_opener_web,sergey-verevkin/letter_opener_web,ProctorU/letter_opener_web