0.0.6

- [X] Create backlog
- [X] Update version
- [X] Remove dead code
- [X] Fix draft folder computation to be in source input directory
- [X] Permit the blog metadata to determine the desired layout
- [X] Refactor main function in multiple sub functions to ease testing
- [X] Update deps version
- [X] Permit options to be null without breaking jekyll publishing
- [X] Ensure install works with clean install mechanism
- [X] When publishing remove the org2jekyll/jekyll-drafts-dir arborescence
- [X] Improve default header computation
- [X] Fix ci-travis for emacs 24.3
- [X] Add ci-travis status badge