add support for quantities and csv export
add coverage
use csv module instead of manual string handling
add coveralls
Merge branch 'master' of https://github.com/Wikidata-lib/PropertySuggester-Python into quantities_and_csvexport

Conflicts:
	.travis.yml
Merge pull request #3 from Wikidata-lib/quantities_and_csvexport

add support for quantities and csv export