Update seeder options
Update seeder options.
Add warnings for sqlite cache backends when working with multiple processes.
fix sphinx warnings for English docs
Merge branch 'branch-6-4' of github.com:mapserver/docs into branch-6-4

Conflicts:
	en/development/rfc/ms-rfc-106.txt
Merge pull request #90 from yjacolin/branch-6-4

Remove IFS things after removing space in all filename
Merge pull request #91 from yjacolin/branch-6-4

cleanup comments for IFS stuff
Merge pull request #92 from yjacolin/branch-6-4

add all langages in PDF_LANGAGE variable
Merge branch 'mapcache_seeder_docs' into branch-6-4
add layout option in <cache> tag example

If the layout="template" is not set, the template is not working.
Merge pull request #95 from stecyr/patch-1

add layout option in <cache> tag example
add comment about read only tileset and zoom  

From http://osgeo-org.1560.x6.nabble.com/MapCache-returning-blank-tiles-when-outside-restricted-extents-td4373381.html  for the read only tileset
and from the https://github.com/mapserver/mapcache/blob/master/mapcache.xml.sample for the min max zoom restriction
Merge pull request #96 from stecyr/patch-2

add comment about read only tileset and zoom
Changed email address
Merge remote-tracking branch 'upstream/branch-6-4' into branch-6-4
add documentation to use transifex