update
Add evaluation for Mr.LDA on 20newsgroup
fixed minor typos
Fixed typos
Merge github.com:kzhai/Mr.LDA into integration
Merge github.com:daithang1111/Mr.LDA into integration
Tweaks to 20newsgroups instructions.
More tweaks on documentation: Topic Interpretability
Minor tweaks.
Updated README.md to include description of 20newsgroup experiments.