Merge pull request #17 from justgo129/master

Uncommented mention of contributors in turtle for chapters (so we now have contributors for images, figures, reports, and chapters)
better docs for list_report
default report type is report
fixed tests
better support for platforms
allow audit_note posting
better instrument support
missing foreign key for instruments
dbdist
Merge pull request #19 from justgo129/master

Former pull #18: Major turtle changes: We now have turtle for: (1) contributors for images, figures, chapters, and reports, (2) turtle formalizing the person-organization-publication relationship, and (3) turtle formalizing the image-dataset-activity relationship. Additionally, (4) modified turtle to reflect report relationships/prov of "citedBy" and "cites"
replaced file->sha1 with file->identifier in turtle for files
Added gcis namespace in turtle for files