* added CentOS, Fedora, RHEL choices with minimal version check (recommited)
* fixed small typos
* added special option --use-php5-package
* parse options and export new environment variable USE_PHP5_PACKAGE
* added choice between php5* or php7.0* packages (recommited)
* fixed php*-fpm service name and php.ini file path (recommited)
* prepare socket name for nginx to work with php5-fpm or php7.0-fpm (recommited)
* added ppa:ondrej/php5-compat repo
* added dependency ppa:ondrej/php repo and package software-properties-common
* added execute permissions to ./centos/*.sh files
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