Travis Build fix

[juhi123]

• Remove Phantom JS as it's deprecated
• Added Chrome Driver
• Update chrome

[PatelUtkarsh]

@juhi123 are you working on this? I am thinking to remove test folder - https://github.com/rtCamp/nginx-helper/tree/master/tests/functional from repo until we hit green.

Let me know your thoughts.

[juhi123]

@PatelUtkarsh I was working on this but didn't get time. Test script is not working, needs to be updated.
Yes we can remove this until we hit green

[PatelUtkarsh]

@juhi123 I've removed tests in #196

You can use git revert 041e0e1 to restore test and there will be some conflicts with your PR since you've already modified it so you need to resolve that conflicts.

You can restore travis file using git revert aaa6c17.