Support wildcard paths in completions

[ghost]

TypeScript Version: master

Code

/// <reference path="fourslash.ts" />

// @Filename: /src/b.ts
////export const x = 0;

// @Filename: /src/a.ts
////import {} from "foo//**/";

// @Filename: /tsconfig.json
////{
////    "baseUrl": ".",
////    "paths": {
////        "foo/*": ["src/*"]
////    }
////}

verify.completionsAt("", ["a", "b"]);

Expected behavior:

Test passes.

Actual behavior:

No completions.