Add description and images for ST_Polygonize
Add description and images for ST_PrecisionReducer and ST_Simplify
Add description and image for ST_Simplify and ST_SimplifyPreserveTopology
Update description and images for ST_Simplify and ST_SimplifyPreserveTopology
Add descirption and images for ST_Polygoniz and ST_PrecisionReducer
Add description for ST_Snap
little updtae for ST_Snap
Update description and Add images for ST_Snap
Add description for ST_Split
Update description and images for ST_Split
Little update for ST_Polygonize, ST_Snap, ST_Split
Update description for ST_Simplify an ST_SimplifyPreserveTopology
Delete ST_Polygonize because is not in the good branch
Update image for comparison between ST_Simplify and ST_SimplifyPreserveTopology
Little correction
Update examples for ST_Simplify and ST_SimplifyPreserveTopology
Update description of ST_SimplifyPreserveTopology
Update description
Update several process functions
Merge remote-tracking branch 'mireille/st_simplify/gh-pages' into m-248-259