fs: use git2go's Odb.ReadHeader to extract object size.

fs: simplify recurse()

fs: parallelize TreeFS creation for Manifest FS.

Put tempdir in GitFSOptions.

Hook up manifest FS

fs: add NewManifestFS, a file system that can mount manifest files.

fs: compile fix. git2go now uses Filemode for TreeBuilder.

manifest: parse groups string into map.

Add a parser for manifest XML files.

Add disclaimer.

Add Go's BSD license.

fs: be more correct about lazy file Release and Flush.

Allow mounting single repos too.

fs: update for namespace *Inode return API change.

Add lazy/disk options.