[Proj] Confusion about Docker images

[Even Rouault]

Hi,

I see in https://hub.docker.com/u/osgeo/
that they are osgeo/proj.4 and osgeo/proj Docker images.

I had some issues to understand what they are / how different they are.

It seems that osgeo/proj is the result of the automated build of master with
https://github.com/OSGeo/proj.4/blob/master/Dockerfile
The leading "# osgeo/proj.4" comment in that file should likely be renamed "# 
osgeo/proj" to avoid the confusion

Whereas osgeo/proj.4 is pulled by travis/docker.sh and used by travis/
build_docs.sh to build the website documentation.
- What is the source of this osgeo/proj.4 Docker image ?
- Shouldn't that be renamed to osgeo/proj-doc-deps or somthing like that to 
avoid confusion ?
- and its description at https://hub.docker.com/r/osgeo/proj.4/ "A Proj.4 
image with a full set of grid files" is also misleading.

Even

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