Add debugger gem

In order to facilitate future debugging, we are adding the debugger gem
to the project. As this is in the Gemfile generated by Rails, all that
was required to add it was uncomment the line in question and run
bundler.

[#41633207]
Configure application to have UTC as default timezone

This commit sets the default timezone for the app as UTC for both Time
methods and for ActiveRecord. It also removes an unecessary pair of
parentheses attached to a call to `Time.now` which did not match the
style throughout the rest of the project.

[#41633207]
Merge pull request #88 from jcaudle/fix-redirect-spec

#41633207 - Fix redirect spec