Full Upgrade for CanJS@4

Fixes for CanJS 4 (#22)

• Update tests to test inserting the components on the page instead of using ReactTestUtils (thanks @ivospinheiro)
• on createComponent ref callback get the component viewModel from the element using can-symbol can.viewModel an assign the react props to viewModel (thanks @ivospinheiro)
• remove can-define from tests; use can-component builtins instead
• use can-reflect to modify viewmodel instance