Decode names of tables to import before importing

This prevents encoded characters in tree paths, mostly blank spaces represented as %20
added man page for osm-history command
updated osm create-changeset manpage
added workshop with osm workflow
fixed unmap operation to detect changes if a new tag is added
Merge pull request #733 from volaya/osm_doc_update

Osm doc update
Merge pull request #734 from volaya/unmap

fixed unmap operation to detect changes if a new tag is added
Merge pull request #721 from volaya/decode_import_url

Decode names of tables before importing, GeoTools gives URL encoded type names