Squashed 'rsem-eval/' content from commit 1d2899f

git-subtree-dir: rsem-eval
git-subtree-split: 1d2899f588bf41c6204b50ec0627ad0488521e18
Basing RSEM-EVAL off of RSEM v1.2.17
RSEM-EVAL v1.8
Updated README to reflect new examples' location.
Updated obsolete statement about single-end reads.