Get code linting / standards files into dev branch

[bmuenzenmeyer]

Take these two code / editor config files from the pattern-engines branch, as the codebase is in dire need of some consistency now that more and more people are hacking on it.

• https://github.com/pattern-lab/patternlab-node/blob/pattern-engines/.editorconfig
• https://github.com/pattern-lab/patternlab-node/blob/pattern-engines/.eslintrc
• Remove IIFE closures from builder/*.js modules per update lineage_hunter - refactor #257
• test & document their use of editorconfig/eslintrc files?

cc @geoffp as discussed, whichever of us gets to this first - no rush.