Use default output path if output metadata is not given.

This feature is lost in jdan/cleaver@0b8ff3d0fdea804e597d4a36e31b7f9d908290a7
Merge pull request #83 from twada/default-filename

Use default path if output metadata is not given.
version bump
Fixed shwr.me attribution
updated github raw URL - fixes #84
version bump
added --debug option, removed janky  options everywhere
Merge pull request #85 from jdan/debug

Debugging option
added debug as a dependency, instead of a devDependency - fixes #86
added weibo field for author