Add description and images for ST_EnvelopesIntersect
Fix navigation after #206

@gpetit @mlecoeuvre
Update comparison example in include for ST_Buffer and ST_MakeEllipse
Add description and images for ST_Buffer
Update ST_Buffer with the new parameter

Conflicts:

	docs/dev/ST_Buffer.md
Merge remote-tracking branch 'upstream/gh-pages' into buffer_with_parameter
Add description for ST_SRID
Update description for ST_SRID
Merge pull request #209 from mlecoeuvre/st_srid

Add description for St_SRID see #110
Add description for ST_Relate
Add images for ST_Relate
Add ST_Translate template
Add creation functions 1
Add creation functions 2
Add edit geometry templates
Add process geometry templates
Add triangulation templates
Fix ST_MakeEnvelope
Fix wrong URLS
Fix next section link