Upgrade to rails and exception_notification 4.0.0 rcs and make tests work again
Tweaks to make it work with v4 base library
Don't run Travis tests on Ruby 1.8.x anymore, since Rails 4 doesn't run on it.
Updated documentation for Rails 4 version
More documentation tweaks
Disable ruby-head in Travis CI since its having some sort of bundler issue
Fixed wrong ExceptionNotifier config example
Upgrade to exception_notification 4.0.0