Don't limit short description char length. Fixes #137.

Also, don't require short_desc by default.

Added comments explaining why you would want to set a character limit.
Explain why a short description is recommended
Merge pull request #141 from codeforamerica/remove-short-description-validations-137

Remove short description validations
Support ability to set email addresses that have access to update a location
Add a spec to ensure exact match between admin email and email parameter
Merge pull request #143 from codeforamerica/add-admin-field-to-location

Add admin field to location
Upgrade Rails to 3.2.17
Update Rails version in README
Upgrade Devise to 3.2.4
Upgrade factory_girl_rails to 4.4.1
Upgrade rspec-rails to 2.14.1
Upgrade metric_fu to 4.8.0
Upgrade mongoid-rspec to 1.11.0
Upgrade enumerize to 0.8.0
Upgrade newrelic_rpm to 3.7.3.204
Upgrade swagger-ui_rails to 0.1.7
Upgrade passenger to 4.0.40
Merge latest CfA changes & put short description validations back

They were removed from the upstream CfA repo, and when I merged, the old SMC code was overwritten because there hadn't been any commits to this repo yet.

Important changes picked up from upstream repo include ability to set someone as an admin so they can make updates to their locations in SMC-Connect Admin, and various gem upgrades.
Update README to tailor it to SMC