Added openssl extension library

When intalling manuallly composer (`php -r "eval('?>'.file_get_contents('https://getcomposer.org/installer'));"`) and the openssl.dll in php is not enabled, The error is not clear to point that the conection https needs openssl.

This is the message generated by composer:

PHP Warning:  file_get_contents(): Unable to find the wrapper "https" - did you forget to enable it when you configured PHP? in Command line code on line 1
PHP Stack trace:
PHP   1. {main}() Command line code:0
PHP   2. file_get_contents() Command line code:1

Warning: file_get_contents(): Unable to find the wrapper "https" - did you forget to enable it when you configured PHP? in Command line code on line 1

Call Stack:
    0.0003     118168   1. {main}() Command line code:0
    0.0003     118560   2. file_get_contents() Command line code:1

PHP Warning:  file_get_contents(https://getcomposer.org/installer): failed to open stream: Invalid argument in Command line code on line 1
PHP Stack trace:
PHP   1. {main}() Command line code:0
PHP   2. file_get_contents() Command line code:1