1st PR on develop branch for easybuild-docs

ping
Ha! This was an optical illusion and I was tricked in the same way as you: 
Here we have `'True'`, not `True` (think as in: `READTHEDOCS=True`)

I suggest to leave it as-is, just to stay compatible with this part:
http://read-the-docs.readthedocs.org/en/latest/faq.html#how-do-i-change-behavior-for-read-the-docs