Adds support for place based reviewers.
Updates local reviewers addition.
Added some documentation for place based reviewers.
Merge branch 'place-reviewers' of https://github.com/codeforamerica/opendatacensus into codeforamerica-place-reviewers

Conflicts:
	doc/admin.md
[#327] Place-based reviewers - updates and tests
[#327] Trim whitespace in place reviewer list
[#327] Use a fake email address for testing
Merge pull request #362 from okfn/codeforamerica-place-reviewers

[#327] Place-based reviewers