Include failing file information on upstream error
Include failing file information on upstream error

Before:
```
Running "esperanto:cjs" (esperanto) task
Warning: SyntaxError: Unexpected token (4:7) Use --force to continue.
```

After:
```
Running "esperanto:cjs" (esperanto) task
Warning: Error parsing lib/handlebars/compiler/base.js: SyntaxError: Unexpected token (4:7) Use --force to continue.
```
developit/grunt-esperanto