Utils for the dtbook-to-daisy3 script
- deal with the 'no levels/headings' case;
- NCX: deal with multiple authors.
- Moved TTS calls from dtbook-to-daisy3 to dtbook-utils;
- Added some doc for create-daisy3-smils.
Added the resource file creation, wrote documentation and renamed some options.
Some XProcSpec tests for the smil generation
- Cleaner and faster way to add the smilref attributes;
- Added doctitle to the DTBook when missing;
- Deal with empty pagenums;
- New tests.
Improved the conditions under which the @smilref must not be added: smilrefs are no longer added to br
Remove 'tts-for-dtbook' from dtbook-utils
replace cx:messge by px:message
Remove useless refs to the Calabash namespaces
Merge pull request #39 from daisy/dtbook2daisy3

Changes required for TTS-based dtbook-to-daisy3