better check for set variable
fixup: codecoverage blunder
fix double precision cast warnings
workaround for calling :source info on a binary program.  On OSX this segfaults instead of giving an error
fix syntax error in performance example
Merge pull request #48 from JuliaGPU/jcb/fixtestsosx

Workaround for calling :source info on a binary program.
Merge branch 'master' into jcb/versioned_api