Merge pull request #2 from wltrimbl/master

Second pass at Biopython / parsing material
Merge branch '2013-06-tufts' of https://github.com/ahmadia/boot-camps
Merge pull request #3 from wltrimbl/master

Two more examples for Tufts
syntax error in exercise-allsixframes
added main() to retrievegbk
Merge branch '2013-06-tufts' of https://github.com/ahmadia/boot-camps