actions: updated help message
printdiff: wider diff lines
new: SourceImage added
entities.Image: repository field splitted to registry+repository
style fixes
entities.Image: use DockerException for errors in response stream
entities.SourceImage: add newlines at end of ENV and RUN stanzas
fixed DockerException raising and handling
entities: do not call functions on import
typo fix
tests fixed (updated fixtures)
Merge pull request #19 from nikicat/master

SourceImage support