Merge pull request #2701 from RosettaCommons/vmullig/fix_spinny_methyls
Fixing N-methyl-D-valine issue, and adding spinny methyls for sarcosine.
The D-amino acid issue was identified by @gbhardwaj, and I think it's due to a mistake in the patch for D-valine (wrong chi index). I also forgot to add spinny methyls for sarcosine, which is important.