[BGBUILD-313] boxgrinder build fails to build ec2 image if ec2-user already exists
[BGBUILD-318] Add support for us-west-2 region

Improve spec flexibility
[BGBUILD-308] Clearer error message when unrecognised file extension is used
[BGBUILD-322] Allow selection of kernel and ramdisk for ec2 and ebs plugins
[BGBUILD-302] Add support for VirtualPC platform
[BGBUILD-195] Add support for OpenStack
Changelog and manifest update
[BGBUILD-304] Standarize plugin callbacks
[BGBUILD-325] Remove kickstart support
[BGBUILD-323] Invalid kernel version recognition makes recreating initrd impossible
[BGBUILD-326] Ensure building from root directory is successful
A bit nicer way of registering plugins.
Fixed tests
Better way of checking if ec2-user already exists.
[BGBUILD-211] Alpha edition libvirt registration support, remote and local

Make SFTP plugin more conducive to reuse

Change to non-greedy operator to prevent chomping of uris
libvirt tests
Update changelog, spec and dependencies for libvirt plugin
update manifest
[BGBUILD-331] Add support for sa-east-1 EC2 region
Fix spec dependencies