filters sorted results and returns top 20 as a collection of JSON objects
creating a losting now correctly associates with logged in user
creating a losting returns top 20 sightings as an array of JSON objects

creating a sighting currently emails the top match

fixes method and variable names for clarity
adds NotificationMailer class with method to email specified user
creates HTML and text templates for mailing
formats strong_params to be easier to read, consistent to the format used in lostings_controller.rb
add configuration settings for Action Mailer in development environment
Merge branch 'master' into action_mailer
Merge pull request #20 from JeuelyFish/action_mailer

Action mailer