Add Ignore Poltergeist JavaScript Errors as a rails til.

rails/ignore-poltergeist-javascript-errors.md

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+# Ignore Poltergeist JavaScript Errors
+
+Poltergeist with PhantomJS (<2.0) does not support JavaScript's `bind()`
+method. This means that when executing an integration test that exercises
+JavaScript with the `bind()` method, an error will occur. If you cannot
+simply upgrade to a version of PhantomJS that supports `bind()`, then what
+can you do?
+
+Ignore the error!
+
+This can be achieved by placing the following rescue block in the
+appropriate place.
+
+```ruby
+rescue Capybara::Poltergeist::JavascriptError
+```
+
+Use this in moderation. You want to make sure you don't ignore actual
+JavaScript errors.
+
+[source](http://stackoverflow.com/questions/22020680/temporarily-set-js-errors-to-false-in-poltergeist)