Update dummy app to rails 4.
Upgrade SuckerPunch to ~> 1.0.

This addresses issues with forking web servers such as unicorn
and closes #1.
Perform duping of DEFAULT_REDACTABLE_SQL_TOKENS in a block.

The dup is evaluated at load time when given as an argument,
but at runtime (when the key is missing) for a block. This
should be the preferred style for non-trivial values.
Update usage of stub to double for RSpec 2.14.