Added Index for VoyageSources
Adding Documentary Sources
Restored deleted file
FIX:  “Source (1 variables)” should be “Source (1 variable)” in both Basic and General lists.
FIX from tests report

“Voyage Itinerary (3 variables)” should be “Voyage Itinerary (4
variables).” “Place where voyage ended” is the omitted variable.
FIX from test results and sources_list view

Fix: - In the “Current query” box “Principal place of slave purchase*”
should offer the user only two options: “Africa” and “Other”
Fixed a tiny typo
FIX from tests report

- the search panel omits “Slaves (characteristics) (7 variables)” from
the search interface, but only for the basic variables option.
Documentary sources sketch
Placeholder for csv download placed
Merge branch 'develop' of github.com:emory-libraries/voyages into develop

Conflicts:
	voyages/apps/voyage/views.py
Corrected header syntax error
Printing documentary sources (unsorted)
Working download current result
Merge branch 'develop' of github.com:emory-libraries/voyages into develop
Printing documentary (no alphabetical order)
Fixed most minor changes except for source displays
Merge branch 'develop' of github.com:emory-libraries/voyages into develop
Merge branch 'develop' into initial_search