ISSUE#494. Cleanup code by adding missing semi-colons and formatting.
ISSUE#494. Remove extra lines and spaces.
ISSUE#494. PEP-8 formatting.
ISSUE#494. General code cleanup. Code was looping through samples and
processes but not using samples, so I removed that outer loop. Also got
rid of printing the results of a call to rethinkdb.
ISSUE#494. Add sample_id as an index.
ISSUE#494. Remove build_samples_projects_denorm because its logic was
wrong. Move what it was supposed to do into populate_new_denorms(). Add
logic to make sure we aren't adding duplicates.
Merge branch 'current-sprint' of github.com:prisms-center/materialscommons.org into current-sprint