prettify xml NodeSeq and NodeBuffer
Merge changes from branch 'prettify-xml' of git://github.com/gcberger/scalatest.
Enhanced Prettifier to handle Fred extends Seq[Fred] case generally.
Changed Prettifier to use stringPrefix.
Added -t support to Framework.
Disallow any suffix for arguments that does not take any suffix.
Bump up release version to 2.1.3-SNAPSHOT in SBT build.
Backed out the change that disallows characters right after -h
without an intervening space, because HTML reporter can take
config params.
Trying Jason Zaugg's fix in 2.1.x branch.
Rework symbol repair utility

  - set the currentOwner of the traverser before starting, otherwise
    it default to `RootSymbol`
  - replace `hasTransOwner` logic with a direct test for symbols
    that were originally owned by the call-site owner.