Added RHEL7 Model from RHEL6
- Modified Kickstart
- Modified os_boot.erb for IP address for /etc/hosts and URL RHEL7 for facter
Modified http_helper.rb adding read_timeout for very large images like RHEL7
Modified client.rb adding new parameter http_read_timeout
Merge pull request #157 from jcpowermac/fb-rhel7-79-rev2

Merging this in temporarily so we could move this functionality to ```redhat-demo``` branch.