Prepare for ESLint 5.0.0

[stevenzeck]

https://eslint.org/blog/2018/04/eslint-v5.0.0-alpha.1-released

[stevenzeck]

Will also take a look at https://eslint.org/docs/developer-guide/nodejs-api#linterverifyandfix versus https://eslint.org/docs/developer-guide/nodejs-api#cliengineexecuteontext which we are using today.

[stevenzeck]

No issues when running tests using v5 as of right now. I tried out verifyAndFix and the tests ran the same, but it doesn't look like it would read an eslint config file to know which rules to use.

[stevenzeck]

Per #39, no issues with what we have implemented thus far and v5. We should be able to merge and do a minor release of this.

[Glavin001]

Could we have Travis CI test multiple versions of ESLint?