Merge pull request #2 from zVPS/master

EPEL runs dynamically and textual changes
added to packages  cronie

Discovered on user this package missing in default install prevent cron from being installed.
Update sentora_centos7_installer.sh
Fixes error on centos 6 ./installer.sh: line 171: dev=dev: command not found
Fixes timezone appended to config twice.
Fixes postfix startup.