Readme and complete workflow redone to include Docker

I have created a Docker image that can execute the Complete Workflow example (Two things not tested at present, running the parallel mark duplicate script since it used way to much memory on my computer and it does not do Single Copy Gene evaluation because of PROKKA / Prodigal debate).

If you have Docker installed, please try the image, binnisb/concoct_0.2.1_full.