See #390. Use global php-cs-fixer on Windows without running within php

By using [node-which](https://github.com/isaacs/node-which)
I believe I am able to get rid of the `php` command running
`php-cs-fixer` as an argument.
`which` will find the `php-cs-fixer` program by looking through
the `PATH` environment variable listed directories.
This will resolve `php-cs-fixer` to an absolute path to the executable
and that will be used to run the command.
This dramatically cleans up the `PHP-CS-Fixer beautifier` code and specs, too!

Doing some Windows tests now.

spec/beautifier-php-cs-fixer-spec.coffee

@@ -123,7 +123,7 @@ describe "PHP-CS-Fixer Beautifier", ->
             p.then(cb, cb)
             return p
 
-      failWhichProgram('php')
+      # failWhichProgram('php')
       failWhichProgram('php-cs-fixer')
 
     unless isWindows

src/beautifiers/beautifier.coffee

@@ -149,9 +149,13 @@ module.exports = class Beautifier
   which: (exe, options = {}) ->
     # Get PATH and other environment variables
     @getShellEnvironment()
-    .then((env) ->
-      new Promise((resolve, reject) ->
+    .then((env) =>
+      new Promise((resolve, reject) =>
         options.path ?= env.PATH
+        if @isWindows
+          # Trick node-which into including files
+          # with no extension as executables
+          options.pathExt ?= ";#{process.env.PATHEXT ? '.EXE'}"
         which(exe, options, (err, path) ->
           resolve(exe) if err
           resolve(path)

src/beautifiers/php-cs-fixer.coffee

@@ -15,24 +15,7 @@ module.exports = class PHPCSFixer extends Beautifier
   beautify: (text, language, options) ->
     @debug('php-cs-fixer', options)
 
-    isWin = @isWindows
-    if isWin
-      # Find php-cs-fixer.phar script
-      @Promise.all([
-        @which(options.cs_fixer_path) if options.cs_fixer_path
-        @which('php-cs-fixer')
-      ]).then((paths) =>
-        @debug('php-cs-fixer paths', paths)
-        _ = require('lodash')
-        # Get first valid, absolute path
-        phpCSFixerPath = _.find(paths, (p) -> p and p.charAt(0) is '/' )
-        @verbose('phpCSFixerPath', phpCSFixerPath)
-        @debug('phpCSFixerPath', phpCSFixerPath, paths)
-        # Check if PHP-CS-Fixer path was found
-        if phpCSFixerPath?
-          # Found PHP-CS-Fixer path
-          @run("php", [
-            phpCSFixerPath
+    @run(options.cs_fixer_path or "php-cs-fixer", [
       "fix"
       "--level=#{options.level}" if options.level
       "--fixers=#{options.fixers}" if options.fixers
@@ -40,34 +23,9 @@ module.exports = class PHPCSFixer extends Beautifier
       ], {
       ignoreReturnCode: true
       help: {
-              link: "http://php.net/manual/en/install.php"
-            }
-            })
-            .then(=>
-              @readFile(tempFile)
-            )
-        else
-          @verbose('php-cs-fixer not found!')
-          # Could not find PHP-CS-Fixer path
-          @Promise.reject(@commandNotFoundError(
-            'php-cs-fixer'
-            {
         link: "https://github.com/FriendsOfPHP/PHP-CS-Fixer"
-            program: "php-cs-fixer.phar"
+        program: "php-cs-fixer"
         pathOption: "PHP - CS Fixer Path"
-            })
-          )
-      )
-    else
-      @run("php-cs-fixer", [
-        "fix"
-        "--level=#{options.level}" if options.level
-        "--fixers=#{options.fixers}" if options.fixers
-        tempFile = @tempFile("temp", text)
-        ], {
-        ignoreReturnCode: true
-        help: {
-          link: "https://github.com/FriendsOfPHP/PHP-CS-Fixer"
       }
       })
       .then(=>