ESLint: Set environments better

Instead of setting ESLint environment to "node" globally, set it on
per-directory basis using separate .eslintrc.json files:

  Directory   Environment
  -----------------------
  bin         node
  lib         commonjs
  spec        jasmine

It was impossible to use this approach for the "benchmark" directory
which contains a mix of files used in various environments. For
benchmark/run, the environment is set inline. For the other files, as
well as spec/helpers.js, the globals are declared manually (it is
impossible to express how these files are used just by a list of
environments).

Fixes #408.

.eslintrc.json

@@ -1,6 +1,3 @@
 {
-  "extends": "eslint:recommended",
-  "env": {
-    "node": true
-  }
+  "extends": "eslint:recommended"
 }

benchmark/benchmarks.js

@@ -1,3 +1,5 @@
+/* global module */
+
 "use strict";
 
 (function(root, factory) {

benchmark/run

@@ -1,5 +1,6 @@
 #!/usr/bin/env node
 
+/* eslint-env node */
 /* eslint no-console: 0*/
 
 "use strict";

benchmark/runner.js

@@ -1,3 +1,5 @@
+/* global module, setTimeout */
+
 "use strict";
 
 (function(root, factory) {

bin/.eslintrc.json

@@ -0,0 +1,5 @@
+{
+  "env": {
+    "node": true
+  }
+}

lib/.eslintrc.json

@@ -0,0 +1,5 @@
+{
+  "env": {
+    "commonjs": true
+  }
+}

spec/.eslintrc.json

@@ -0,0 +1,5 @@
+{
+  "env": {
+    "jasmine": true
+  }
+}

spec/api/generated-parser-api.spec.js

@@ -1,6 +1,5 @@
-/* eslint-env jasmine */
 /* eslint no-console: 0 */
-/* global PEG */
+/* global PEG, console */
 
 "use strict";
 

spec/api/pegjs-api.spec.js

@@ -1,4 +1,3 @@
-/* eslint-env jasmine */
 /* global PEG */
 
 "use strict";

spec/api/plugin-api.spec.js

@@ -1,4 +1,3 @@
-/* eslint-env jasmine */
 /* global PEG */
 
 "use strict";

spec/behavior/generated-parser-behavior.spec.js

@@ -1,4 +1,3 @@
-/* eslint-env jasmine */
 /* global PEG */
 
 "use strict";

spec/helpers.js

@@ -1,3 +1,5 @@
+/* global require */
+
 "use strict";
 
 (function(root) {

spec/unit/compiler/passes/generate-bytecode.spec.js

@@ -1,4 +1,3 @@
-/* eslint-env jasmine */
 /* global PEG */
 
 "use strict";

spec/unit/compiler/passes/helpers.js

@@ -1,4 +1,3 @@
-/* eslint-env jasmine */
 /* global PEG */
 
 "use strict";

spec/unit/compiler/passes/remove-proxy-rules.spec.js

@@ -1,4 +1,3 @@
-/* eslint-env jasmine */
 /* global PEG */
 
 "use strict";

spec/unit/compiler/passes/report-infinite-loops.spec.js

@@ -1,4 +1,3 @@
-/* eslint-env jasmine */
 /* global PEG */
 
 "use strict";

spec/unit/compiler/passes/report-left-recursion.spec.js

@@ -1,4 +1,3 @@
-/* eslint-env jasmine */
 /* global PEG */
 
 "use strict";

spec/unit/compiler/passes/report-missing-rules.spec.js

@@ -1,4 +1,3 @@
-/* eslint-env jasmine */
 /* global PEG */
 
 "use strict";

spec/unit/parser.spec.js

@@ -1,4 +1,3 @@
-/* eslint-env jasmine */
 /* global PEG */
 
 "use strict";