create a new 'library' component for pdfs of books

[amyfou]

this is to add the monographs we have as pdfs in a centralized location on the site. This will require:

• [x] Amy to put the books into a directory on dropbox
• [x] that directory to be added to our shell script to grab and index all the static files
• [ ] the relevant database entries to be built (maybe similar to 'texts' area)
• [ ] the front end component (maybe call it the 'library'?) where folks can access the works in pdf. This component should be on a protected route unless/until Audra tells us otherwise.

[amyfou]

the monographs are now in dropbox in the 'sources' dir. This dir was already picked up by the script, so if you run dropbox-sync.py you'll get them into the local file structure.