Use phar to install tools on cmd image

[rasodu]

Switch to phar installation for following tools

• composer
• PHP_CodeSniffer
• phpDocumentor

Install these commands to '/usr/local/bin/' => http://unix.stackexchange.com/questions/8656/usr-bin-vs-usr-local-bin-on-linux

Create script called installphar.sh <url> <final-command-name> to install phar with following commands : https://phpunit.de/manual/current/en/installation.html

[rasodu]

Composer install instruction already provide a script to install phar file. Therefore new phar installer will not be used to install composer.