Support for Flow intersection types

[PCreations]

documentation.js supports Flow union type but doesn't seem to support intersection. Any reason to not supporting it ?

export type Foo = {a: number} & {b: number};

Should generate :

Type: ({a: number} & {b: number});

But documentation.js doesn't generate anything.

[tmcw]

Good point, we don't currently port these over. The reason why I didn't port this over in the first pass was that there's no JSDoc equivalent of intersection, only of union. Which isn't a total blocker, but we'll need to invent a JSDoc-esqe representation, most likely.

[tmcw]

Merging into #725, the tracking issue for supporting type systems that aren't just JSDoc.