Support for wildcards in command line

It would be great if we could have wildcard support for files.

``` bash
tsc -w -m amd -t es5 **/*.ts
```

Currently we need to use unix commands.

``` unix
find . -name "*.ts" | xargs tsc -w -m amd -t es5
```

There are also cases when we would like to have wildcards for multiple different folders

``` bash
tsc -w -m amd -t es5 _generated/**/*.ts Typescript/**/*.ts
```
