Switch fedora build to F19
Fixed bugs:
  - broker log files had incorrect permissions and selinux label
  - min gear uid setting conflicted wth login.defs
  - resolv.conf is manually updated on ec2 machines
  - nic HW address is no longer hardcoded (allow ec2 machines to stop/start)
Added feature:
  - Support for custom network device (if not eth0)
  - Added v2 cartridges
Merge pull request #66 from kraman/f19_fixes

Switch fedora build to F19