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
Update version in documentation