initial commit: populate navigator.epubReadingSystem object with additional readium-specific build info (version, date, git commit sha, etc.)
added new EPUB in library, for epubReadingSystem "dump"
Merge pull request #222 from readium/feature/epubReadingSystem_versionInfo

Populate navigator.epubReadingSystem with build info (git, date, version, etc.) + EPUB to display object