Merge pull request #8 from rnc/master

Fix extraneous output after multiple runs of the extension. Upgrade to c...
convert to galley apis for resolving overrides and version metadata.
all tests pass on new Galley-based APIs.
configure logback based on ~/.m2/logback.xml, and detect when debug mode is enabled in maven (and reflect it in logback as well)
fix awkward phrasing