Add reading rooms to the contact landing page
use Library notation, hinge plurality on number of them
If SHOW_WEBFORM is False in settings, don't link to our webform.

This allows us to change, in a per-environment way, whether or not
our app surfaces links to our custom (not yet done) webform.
Early return meant multiple reading room links were not added
Rename rooms to libraries in parent_profile, but unclear if this will ever be used
Add closing endif tag
No email or request form, do not display form link
Add test for no email scenario
API returns 400 if request for agency with no email
Add comments
Merge pull request #275 from 18F/reading_rooms_fix

Early return meant multiple reading room links were not added
Merge pull request #278 from 18F/no_email_api

API returns 400 if request for agency with no email
Merge pull request #272 from 18F/hide_webform

Offer feature switch to turn off link to our webform
Merge
Add some documentation of new flag
Merge pull request #276 from 18F/no_web_no_email

For agencies with no email address, do not display a request form
Add initial request API documentation
Merge pull request #269 from 18F/reading_room_display

Add reading room links to the contact landing page
Add GET method to documentation
Add language around simple, complex processing request times