lock down version of eslint packages

[leonidez]

In src/lib/create.js:

Make sure that the eslint packages needed per http://guide.meteor.com/code-style.html#eslint-installing are locked down so we do not have version bumps during installs/updates. Currently the packages are added per the npm command without version constraints.

[Chun-Yang]

We are now using poetic-linter