DOC: updated for the moving pictures tutorial 1.9.0 data

~~**NOT READY FOR MERGE**~~

Various updates, included collapsing all inputs into a single fastq file (which is a more common use case than multiple fastq files) and use of the ``--recover_from_failure`` option for ``core_diversity_analyses.py`` to add categorical analyses. 

Working on some strange clustering of samples - it's possible that I have some mislabeling here. 
Also, can you describe the *Greengenes core set* somewhere? This is often a source of confusion for users, so it'd be great to have a quick description since it is separate from the GG 13_8 distribution.