Gabe Levi fe5193a40a Support defaults in Flow's type parameter declarations ...

The primary goal of this commit is to add the ability to parse type parameter
declarations with defaults, like `type Foo<T = string> = T`. While I was in the
code, I fixed a few small things, like

* Type parameter declarations need 1 or more type parameters.
* The existential type `*` is not a valid type parameter.
* The existential type `*` is a primary type
* The param list for type parameter declarations now consists of
  `TypeParameter` nodes

2016-04-27 16:12:10 -04:00

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