Bump version for dev
Use ActionDispatch to get the HTTP status code for the exception

* When ActionDispatch::ExceptionWrapper is available, use it to grab the exception's status code, return a 500 otherwise.
* Update show_error_page to accept the caught exception
* Send show_error_page the exception
Add test for ExceptionWrapper exception handling
Simplify test case a bit
Merge pull request #176 from evertrue/exception-response-codes

Exception Response Codes