Add geometry field types

[leplatrem]

• Point
• Line
• Polygon
• Posted values will be coordinates list, like those stored in GeoJSON format
• Will be rendered as GeoJSON individually
• Collection of records will be rendered as GeoJSON only once issue Records formatting #12 is implemented

[leplatrem]

Remains to be done :

• A point should not be a colander.Sequence but a PointNode
• Make use for colander.Range validators for GPS coordinates
• Add check on LinearRing for polygons (last coordinate must be equal to first one).
• Add holes for polygons (list of _LinearRing_s : first is exterior, following are holes)

[leplatrem]

Done !

Would be glad if someone could review code and docstrings please !

[almet]

commented there. I think a pull request would have been more appropriate, however.

[almet]

Overall, I like it! We should probably put all that in a separate module (.geo ?) like you proposed.
Also add some functional tests for it.

[leplatrem]

Code review is not very convenient on Github indeed... But since I'm a "repo collab", a branch is appropriate isn't it ?

Regarding the separate module, shall I make schemas a package then ?

We can discuss here :

• the meaning and naming of that gps parameter instead of there
• the proper approach for unit testing deserializations. Actually I globally followed the way colander does it

[almet]

you can push a branch like you did and then issue a pullk request from this branch to master. that allows us to comment the overall diff.