Added script extract_barcodes.py, along with a tutorial. Partially addresses request in #531 regarding barcodes in headers.
Made changes suggested by Greg C.
Made modifications to address problems/suggestions for code
Fixed conflict in Changelog.Md
made changes to remove consternation-causing passive voice.
fixed conflict in Changelog.md
Fix for conflict in tests/test_format.py
Merge pull request #1236 from walterst/extract_barcodes_nov_27_2013

Added script extract_barcodes.py, along with a tutorial. Partially addre...