Running tests against Qt 5.5 does not work

When capybara-webkit is compiled against Qt 5.5 tests start experiencing problems related to this thread: thoughtbot/capybara-webkit#494.

If you compile against 4.87 then the tests pass again

Author: mikfreedman

README.md

@@ -28,6 +28,8 @@ Development
 ===========
 Whiteboard is a Rails 4 app. It uses rspec with capybara for request specs.  Please add tests if you are adding code.
 
+Whiteboard feature tests are incompatible with Qt 5.5, ensure you have a lower version installed before running `bundle`
+
 Whiteboard [is on Pivotal Tracker](https://www.pivotaltracker.com/projects/560741).
 
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