Speedup osm. compatibility with postgis
Change structure of OSM, move tag value to join table of way and node
Fix new structure
Create linestring only if there is at least two points, empty linestring otherwise
Create polygon if BUILDING is in tags
remove geometry columns in way table
Remove geometry column in way, other fix and doc
Update documentation
Change function doc
Merge pull request #6 from nicolas-f/osm_xml_importer

Osm xml importer