Add php-cs-fixer code style pre-commit hook

Check staged files for code style correctness and abort
if any file fails a style check test.

Reorganise repository to allow per-hook documentation.

php-cs-fixer-pre-commit/README.md

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+# PHP Code Style Fixer Pre-Commit
+
+To use this pre-commit hook, you will need to have [php-cs-fixer.phar](http://get.sensiolabs.org/php-cs-fixer.phar) somewhere in your path.
+
+This pre-commit hook will look at files being commited if the file
+
+    - has a .php extension
+    - is inside the local code pool, i.e. app/code/local
+    - is not a controller (which do not obey PSR-0 class name -> path conventions)
+
+Qualifying files will be run through php-cs-fixer.phar to check for code style issues. If an issue is found, a diff of suggested changes will be displayed and the fixers that failed listed. The commit will then be aborted.
+
+To force a commit to bypass these checks run git commit with the --no-verify argument.

php-cs-fixer-pre-commit/php_cs

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+<?php
+
+$finder = Symfony\CS\Finder\DefaultFinder::create()
+    ->name('*.php')
+    ->name('*.phtml')
+    ->name('*.xml')
+    ->exclude(array(
+        'lib',
+        'shell',
+        'app/Mage.php',
+        'app/code/core',
+        'app/code/community',
+        'app/design/frontend/default',
+        'app/design/frontend/enterprise/default',
+        'app/design/frontend/base',
+        'app/design/adminhtml/default')
+    )
+    ->notName('*Controller.php')
+    ->notName('*ControllerTest.php')
+    ->in(__DIR__);
+
+return Symfony\CS\Config\Config::create()
+    ->finder($finder);

php-cs-fixer-pre-commit/pre-commit

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+#!/usr/bin/env bash
+
+ABORT_COMMIT=false
+
+while read -r FILE; do 
+  if [[ $FILE =~ 'app/code/local' ]]; then
+    php-cs-fixer.phar fix --dry-run --diff -v $FILE
+    if [ $? -gt 0 ]; then 
+      ABORT_COMMIT=true
+    fi
+  fi
+done < <(git diff-index --name-only --diff-filter=ACM --cached HEAD | \
+  egrep '\.(php)$' | egrep -v 'Controller.php$')
+
+if [ $ABORT_COMMIT = true ]; then
+  echo "Code style errors found, aborting commit"
+  exit 1
+fi