Nth PR on develop branch for easybuild-docs, for N=6


Hi @boegel, @stdweird,

I think the new structure is better visible at this point; can you validate?
Best way to visualise it is this one: http://easybuild-docs.readthedocs.org/en/develop/
However, giving the feedback in github style over here would help it advance faster, I guess...
only show GCC, goolf, netCDF (dep example), WRF:

```
[...]
== building and installing GCC/4.7.2...
[...]
== building and installing goolf/1.4.10...
[...]
== building and installing netCDF/4.2.1.1-goolf-1.4.10...
[...]
== building and installing WRF/3.5.1-goolf-1.4.10-dmpar...
[...]
== Build succeeded for 21 out of 21
```