Fix Travis tests failing on distributions other than trusty (RefugeRe…

…strooms#606)

* Revert ".travis.yml: Set "dist" to "trusty" (RefugeRestrooms#600)"

This reverts commit ac8f6ab.

Doing this to run tests on Travis to investigate why they
aren't passing.

* Explicitly require locations.rb in rspec.rb

Tentative fix for tests not passing in xenial but passing in trusty.
This might be because different distributions load files in a
different order. In xenial, `rspec.rb` might get loaded before
`locations.rb`, making `Locations` uninitialized. Explicit require
fixes this.

.travis.yml

@@ -2,7 +2,6 @@ env:
   global:
     - CC_TEST_REPORTER_ID=c18df080592f9c99ca8080a6d5e052aa5fd3964044a0fe0b71e48f8e18998dc2
 language: minimal
-dist: trusty
 services: docker
 install:
   - docker-compose build

spec/support/rspec.rb

@@ -4,6 +4,8 @@
 # spec/spec_helper.rb
 #
 
+require_relative './locations.rb'
+
 Capybara.register_driver :poltergeist_debug do |app|
   Capybara::Poltergeist::Driver.new(app,
     :js_errors => false