Fix for #350 middleware caching

[tleish]

clear middleware cache each time rails restarts and calls middleware is initialized which will resolve issue #350

[PikachuEXE]

This is the same as removing the caching in middleware
Is that what you intended to do?

[PikachuEXE]

Can you add a change log entry?

[tleish]

Added entry to changelog

[PikachuEXE]

Thanks :D