lists with lic's should not use bullets or numbering

also removed references to strict schematron from test files
renamed all tpb* error ids into nordic* ids

fixes #183
improved schematron error messages in nordic2015-1.opf.sch
improved messages in epub3 schematrons

fixes #185
fixes #128
changed dtbook guidelines revision from 2011-2 to 2015-1

2011-1, 2011-2 and 2015-1 are all valid, but when converting to dtbook, 2015-1 will now be used
Merge pull request #246 from nlbdev/dev-2014-12-09

Improved the rest of the schematron messages, also changed dtbook guidelines to 2015-1