use ES6 in Node-only sources; closes #3146

- rename all `.eslintrc.yaml` to `.eslintrc.yml` to be consistent

Signed-off-by: Christopher Hiller <boneskull@boneskull.com>

Author: boneskull

.eslintrc.yaml renamed to .eslintrc.yml

@@ -1,11 +1,11 @@
 root: true
+extends: semistandard
 env:
-  node: true
-  browser: true
+  node: yes
+  browser: yes
+  es6: no
 parserOptions:
-  ecmaVersion: 5
   sourceType: script
-extends: semistandard
 rules:
   strict:
     - error

bin/.eslintrc.yml

@@ -0,0 +1,3 @@
+env:
+  es6: true
+  browser: false