v0.21.0

#727 Unshelve on current commit if parent commit can not be found (with --force option)
#722 Bugfix
#717 Bugfix
#716 Bugfix
#715 Bugfix
#674 Better branch management
#703 Being able to clone a Tfs subbranch with --with-branches option
#702 Add unit tests
#701 Docfix
#696 Docfix
#693 Bugfix
#683 Bugfix
#678 Fix missing merge parent
#675 Improve init with renames
#671 Bugfix
#662 Being able to clone TFS path "$/"
#670 Docfix
#664 Improve reliability of fetch
#667 Bugfix
#668 Bugfix
#657 Bugfix
#639 Add --batch-size to let the user specify the number of changesets fetched at the same time (for big history and big changesets)
#646 Fix changeset ordering
#636 Add --force to unshelve command
#638, #681, #721 Update libgit2sharp
#640 Bugfix
#629 Cleanup now that we do not need VS2008 support
#626 Fetch by lots
#620 Make rcheckin --quick the default
#625 Perfs get last changeset id
#618 Shorten workspace path
#623 Add checkout command
#480 Support renamed tfs branches, baseless merge and automatic branch initialisation when encounter merge changeset

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