Bump version 1.6.12.1 to reflect developing against DS 1.6.12
PlistModel re-encodes any xml plists on the file system as bplist format when sending them back to the client, which is what the client now expects.
Fixed a few RSpec examples where the content type was application/octet-stream when it should have been text/xml, This is because deploystudio uses text/xml in every single case, even when the content isn't text or xml.
Uncomment/add more specs for computer status testing.
Fix scripts RSpecs invalid reference to shared context and invalid uri parameter name.
Add fixture for host status: DS client at workflow selector.