Merge pull request #29 from wdblair/master

Rewrote the n-body benchmark problem to be like the fastest C program.
Updating: reorganizing a CLBG example
Updating: improving CLBG/n-body
Updating: very minorly tidying-up
Updating: working on libats/stringbuf
Updating: improving libats/stringbuf
Updating: improving libats/stringbuf