Initial commit
1) added announcement model, controller and associated views
2) adjusted routes.rb to include announcements
updated announcements for teams
removed binding.pry's
edited application.html.haml file to remove admin/announcements option
updated routes and announcements controller
added markdown support for announcements
added ability to delete announcement
updated routes
truncating announcement title and description in views
added factory for announcements
Can import exercises.
Highlight exercises on lessons page.
Filter lessons if they can be submitted.

For use with the `et` gem.
Wrote test to make sure that comments can be found on a users profile page
updated dashboard controller to limit db strain
added team_id index to announcements
dashboards controller updated for last 5 announcements; announcement and team views updated to limit to 50 for database strain
updated user show view for comments and controller to calculate count for # of comments on submissions
Add test for viewing announcements.

Pending tests for adding/removing announcements.
added tests for adding and deleting announcements