Rename "sites" to "tracking"

Also move tracking to first in list
Change label of date_received

Fixes #35
Remove toISOString calls

Fixes #38
Add text to enable/disable sites

Fixes #31
Add help text for uploading

Fixes #34
Change visual weights of various elements on doc

Fixes #33
Add Document button at top & bottom of list
Add ability to create admin users

Admin users cannot have "country"

Fixes #37
Fix splash page button

Fixes #39
Add searching for documents by country for admins
Bugfix for if no location on a document
Select country from list if filtering on it
Fixes #36
Updated documents with new help text
Add whitespace and collapse the jade documents a little bit
Fix missing whitespace
Mongo accepts Dates, not Moments.

Fix location of sites by restoring toISODate in template & also sort by
value instead of toString

Fixes #40
Add index to remember position for disabling
Doc routes/sites
Bugfix deleting dates

Also doc lib/sites.js