Merge pull request #5 from jakub-zwolakowski/master

Corrected the JSON output for incompabilities in the Coinst_json module.
Adapted the code that downloads migration information (now served over HTTPS).
Fixed to compile with OCaml 4.01
Added mini-Debconf talk
Work of the minidebconf slides
Slide updates
Comigrate: download .gz files, as sid switched to .xz but not yet testing
Merge branch 'master' of https://github.com/vouillon/coinst
Updated CHANGES file
Comigrate: create output directory if necessary
Slide updates
Slide updates
Minor additions in slides
Fixed typo in HTML output
Slides: typos
Report: download gziped control files, as .bz2 files are no longer available
Comigrate: deal gracefully with non-fake binary packages without source in testing
Comigrate: do not fail when the break directive mention non-existent packages
Comigrate: deal gracefully with packages without source
Comigrate: changed age computation, following Britney updates