Implement cache control for Resources #6

Implement a cache control mechanism, much akin to a2enmod expires to control the browser's cache mechanism to prevent static resources from being reloaded every single time.

Add a parameter to Resources::registerResource() which states the cache policy. This ensures that cache can be controlled on a per resource basis.

Implement a cache control mechanism, much akin to ``a2enmod expires`` to control the browser's cache mechanism to prevent static resources from being reloaded every single time. Add a parameter to ``Resources::registerResource()`` which states the cache policy. This ensures that cache can be controlled on a per resource basis.

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Implement cache control for Resources #6