Version 2.0.0

BREAKING CHANGES:

• getComponent/addComponent/etc. now return a pointer (sorry). This may be changed back in the future, I mainly did this so I can make a wrapper pointer class (but we'll see if it's even necessary).
• Removed CRTP requirement for Components and Systems
• Supply list of component requirements/exclusions via variadic template (e.g. struct MySys : System<Requires<Foo, Bar>>; #20)
• Removed boost dependancy completely

Minor changes:

• Supply functors to World::createEntity

Misc:

• A boatload of more test cases
• Fixed animation bug(s) in examples
• Fixed collision example

There's probably some more I missed.