Move images to the contributing section
Add .gitignore to exclude _build folder
Add basic infrastructure for building the contributing section
Move omerocmd custom role to the common configuration file
Fix doc internal links and use omero_doc extlinks when relevant
Create _static/ folder with single .gitignore file
Add contributing to the main Makefile
Move OME logo to common/images
Merge pull request #15 from sbesson/contributing_dev

Add infrastructure to build the contributing documentation set