Prepare development of v0.4.0
Update vmfest to 0.4.0
Fix exception+msg when image-id points to a non-existing image.
Use ex-info instead of RuntimeException.
Use vmfest-0.4.0-alpha.1
Merge branch 'feature/vmfest-0.4.0' into develop

Conflicts:
	project.clj
update vboxj*.jar to version 4.3.6
Delete old vbox libs.
Update README for 0.4.0
Updated project.clj, release notes and readme for 0.4.0-alpha.1
Merge branch 'release/0.4.0-alpha.1' into develop
Updated version for next release cycle