Update to latest bootstrap stable release v2014.09.24

* Fixed salt tag version matching to also accept, for example, v2014.7. saltstack/salt-bootstrap#464
* Fix the EPEL 7 URL since epel-release is now 7.2
Merge pull request #16096 from s0undt3ch/2014.1

[2014.1] Update to latest bootstrap stable release v2014.09.24