Typescript: Add support for Dictionary in intellisense file generation

Dictionary will be now be generated properly in Typescript as reported in this [old issue](https://github.com/madskristensen/WebEssentials2013/issues/338#issuecomment-31635732)

C#
```c#
Dictionary<string, int> Foo
```
Was
 ```js
Foo: any[];
```
And now is
 ```js
Foo: { [index: string]: number; }
```