Issue #86 fixed - PEAR_exception Dependancy

When I install phrozn first time, I got a error with PEAR_exception not exists message even if they installed.

	Warning: require_once(PEAR/Exception.php): failed to open stream: No such file or directory in /Users/haruair/Repositories/phrozn/vendor/pear/console_commandline/Console/CommandLine/Exception.php on line 28

	Fatal error: require_once(): Failed opening required 'PEAR/Exception.php' (include_path='/Users/haruair/Repositories/phrozn/vendor/pear/console_commandline:/Users/haruair/Repositories/phrozn/Phrozn/:/Users/haruair/Repositories/phrozn:/Users/haruair/Repositories/phrozn/bin/../:.:') in /Users/haruair/Repositories/phrozn/vendor/pear/console_commandline/Console/CommandLine/Exception.php on line 28

I don't have PEAR in global environment so I added copy method in composer post-install-cmd. This patch can be solved the Issue #86. I think it is not good approach but it works for me. Please check this for non-PEAR-global-environment.