initial artstor profile
id source changed
universal empty lives cleaner for json trees, WIP
universal empty lives filter
Do not put bogus date values in date start/end
filter-empty-values module code cleaned, created unit test for the module
created module for fetching artstor document source + unit test
added artstor source fetcher for artstor profile
Merge branch 'artstor'
physical format handling fix
physical format handling from format and type unit test
fix function name typo (artstor source field fetcher)
Merge branch 'artstor'
circa abbreviations fix for created date parser
date range unit test fix; added tests for dates with circa abbreviation;
year range parser fix
artstor preview url module added + unit test
enrich-date: circa pattern changed to python 2.6 style for backward compatibility
added pessimistic (scan and check only passed keys) document filtering in addition to optimistic (scan all except ignored);
changed a way of filter empty fields for Artstor in profile (from "all except ignored" to "only given keys")