Add  ST_BoundingCircle and ST_Densify
Add st_expand function
with uri, it is always the same separator
Fix st_expand and add tests
Add st_octogonalEnvelope and St_minimumRectangle
Add ST_RemoveRepeatedPoints
Prepare the st_extrude function
Improve extrude on linestring
Improve extude method
Add new edit and create functions and utilities
Improve st_extrude function
Fix st_expand and add st_makeenvelope
merge
Gib fix for @Nicolas
Prepare GeoJson geometry converter
Add st_asgeojson function
Update docs
Merge pull request #1 from agouge/erwan

Update docs
Improve geojson geometry converter
Improve geojson geometry converter