See #375. Install htmlbeautifier, php-cs-fixer, emacs for Windows CI

appveyor.yml

@@ -77,10 +77,26 @@ install:
 
   # Ruby & Gem
   - cinst ruby -y
+  # Rubocop
   - gem install rubocop
+  - where rubocop
+  # HTMLBeautifier
+  - gem install htmlbeautifier
+  - where htmlbeautifier
 
   # PHP
   - cinst php -y
+  - where php
+  # Composer
+  - php -r "readfile('https://getcomposer.org/installer');" | php
+  - echo @php "%~dp0composer.phar" %*>composer.bat
+  # PHP-CS-Fixer
+  - ./composer.phar global require fabpot/php-cs-fixer
+  - where php-cs-fixer
+
+  # emacs
+  - cinst emacs -y
+  - where emacs
 
 build_script:
   - cd %APPVEYOR_BUILD_FOLDER%