The foss/2014b toolchain

This is the VSC foss 2014b toolchain. The foss toolchain should be added to easybuild in order to test these configs.
as pointed out by @rtmclay, it doesn't make much sense to build/install OpenBLAS on top of an MPI-enabled toolchain, since it doesn't rely on MPI

Change this to the below?

```python
toolchain = {'name': 'GCC', 'version': '4.8.3'}
```