Jbb

- Warn if dependency is unavailable for requested platform instead of
raising exception
- Add timestamps for extracted library files if missing in tar.gz

- Resolve package version numbers if specified with upstream git tags
- Get version info from Project.toml [compat] section if present to pull
the right version of a package dependency
- Return a list of directories containing the library binaries for
downloaded packages rather than copying files to outdir
- CLI prints library directories separated by ; or : depending on OS
- Output directory is converted into an absolute path

- Add support for specifying a different GitHub project (user/org) than
JuliaBinaryWrappers using the --project | -p flag
- Add missed short flag for --arch as -a

- Add support to download a specific version of a package or its dependencies
- Process a package only once if encountered multiple times as a dependency
- Change static short flag to -s and sanitize to -z since it will rarely be used
- Fixed issue where jbb could not be imported once installed

- Initial release