Update Chrome to Chrome 60 on Ubuntu 14

selenium
chrome

#1

Current the Ubuntu 14 image has Chrome 54: https://circleci.com/docs/1.0/build-image-trusty/#google-chrome

Chrome 60 has support for headless chrome which can be important for many people using that for testing. Right now my build wastes 25 seconds installing latest chrome. Can you please update the latest chrome on the trust build.


#2