add MANIFEST.in
Remove definitions in Lojban syntax from English Wiktionary

While I have a soft spot for Lojban, I don't think cramming a Lojban
textbook into Wiktionary is the way to go, and the results certainly
don't make sense in ConceptNet.
Separate 'source_uri' from 'sources' for backward compatibility
revise build steps
sort the flat list of sources
Update tests for "source_uri" field