Add iso_sha256 to facilitate use of published upstream checksums
fix for issue #780, The checksum option does not work
Add Fedora 20 support
Add OpenBSD 5.4 support
Fixed tiny typo, "iso_dowload_timeout"
Merge pull request #883 from braddeicide/master

Add iso_sha_256, fix checksum not working, add Fedora 20, OpenBSD 5.4