Merge branch 'feature/@plugin' into 3.x

* feature/@plugin:
  All tests passing for @plugin - Inline JavaScript disabled by default - Deprecated "preprocessor" option removed (preprocessor plugins still valid)
  Plugin loader set up for lessc, node, and browser

Author: matthew-dean

.jscsrc

@@ -1,5 +1,5 @@
 {
-    "disallowImplicitTypeConversion": ["numeric", "boolean", "binary", "string"],
+    "disallowImplicitTypeConversion": ["numeric", "binary", "string"],
     "disallowKeywords": ["with"],
     "disallowMixedSpacesAndTabs": true,
     "disallowMultipleLineBreaks": true,
@@ -14,7 +14,7 @@
     "disallowSpacesInNamedFunctionExpression": {
         "beforeOpeningRoundBrace": true},
     "disallowTrailingComma": true,
-    "disallowTrailingWhitespace": true,
+    "disallowTrailingWhitespace": false,
     "maximumLineLength": 160,
     "requireCommaBeforeLineBreak": true,
     "requireCurlyBraces": [   "if",

Gruntfile.js

@@ -31,7 +31,7 @@ module.exports = function (grunt) {
         shell: {
             options: {stdout: true, failOnError: true},
             test: {
-                command: 'node test'
+                command: 'node test/index.js'
             },
             benchmark: {
                 command: 'node benchmark/index.js'
@@ -241,14 +241,6 @@ module.exports = function (grunt) {
                     outfile: 'tmp/browser/test-runner-global-vars.html'
                 }
             },
-            postProcessor: {
-                src: ['test/browser/less/postProcessor/*.less'],
-                options: {
-                    helpers: 'test/browser/runner-postProcessor-options.js',
-                    specs: 'test/browser/runner-postProcessor.js',
-                    outfile: 'tmp/browser/test-runner-post-processor.html'
-                }
-            },
             postProcessorPlugin: {
                 src: ['test/less/postProcessorPlugin/*.less'],
                 options: {