Update introduction.rst

I am adding my support to this pipeline. Please feel free to polish my language.
Merge pull request #70 from tanglingfung/patch-1

Update introduction.rst
Merge bcbio-nextgen usage from Luca
Merge slurm and SciLifeLab introduction from Roman. Fixes #64
Small cleanups in users section for formatting
New release v0.7.0. Move new installer in place. Update documentation. Bump versions for requirements
Remove travis link until automated CI tests work cleanly