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. 
Might be clearer as:

*In this step, we run ``validate_mapping_file.py`` to ensure that our mapping file is compatible with QIIME.*