Merge pull request #81 from jmchilton/master

End need to specify or change distribution and dist_name in most cases.
Add automatic distribution checks for debian, scientific linux and mac os x. #81
Proteomics: Remove problematic ia32-libs package, seems to conflict with gnuplot dependencies. Need to be more specific with 386 libs to install I guess.
Implement auto dist_name check for debian systems.
PEP-8 whitespace fixes and fill out comment on _setup_distribution_environment slightly.