Merge pull request #52 from thebigspoon/master

Examples for PostGIS Layers #13, #14, #15
Use layer as feature iterator

There's no room for bugs in "for feature in layer:" and users should use this iterator whenever they can.
Merge pull request #54 from sgillies/patch-1

Use layer as feature iterator.  Thank you Sean!  We are relatively new to the Python GDAL/OGR API but enthusiastic :)
Add example to project a geometry.  Closes issue #66
Merge pull request #70 from jericks/ISSUE_66

Add example to project a geometry.  Closes issue #66