Add scenario based optimization module

[Kaliumhexacyanoferrat]

As the developer of a web application, I would like my application to be automatically optimized based on some hints, so that it is fast in generation and consumption.

Example

var website = Website.Create() 
                     .Optimize(Aspect.Website | Aspect.Static | Aspect.UseMemory);

Host.Create()
    .Handler(website)
    .Optimize(Aspect.Secure)
    .Run();

Acceptance criteria

• The functionality is implemented in a new Optimization module which deprecates the Practices module
• The functionality is implemented as a concern which can be added to handlers and/or the host
• All aspects are well documented in their purpose and implication
• Aspects can be combined which may implies a different implementation
• Aspects are inherited down through the handler chain (to be respected, not to be imlemented)
• Optimizations which are already applied on higher level (e.g. compression) are not duplicated
• The aspects above are refined during implementation
• Acceptance tests have been added to ensure the functionality