Release 0.3.0

• Added #rebuild_failed! method to Package model to rebuild only failed builds
• Added setter methods for package title and description
• Added #dirty? method to Package model to identify if a package needs to be saved
• Added #repositories method to Project model to list all build repositories
• Added #binaries method to Package model to list all built binaries
• Added #run_service! method to Package model to trigger remote services
• Added #sources method to Package model to retrieve sources of a package container