Original image request hangs

[jgillman]

As mentioned in the 'sharp' pull request requesting the original image without any modifiers seems to hang.

For example, the request http://localhost:3003/test.png does not resolve until it either times out or the user kills the request in the browser. When that happens the following is output in the console/logs:

GET /test.png - - ms - -

[jimmynicol]

Fixed in the latest sharp branch.