Add ability to easily cleanup #11

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@sindresorhus Maybe all the functions could accept an option that make it return an array with the original result and a cleanup method.

const tempy = require("tempy");

const [tempFile, cleanup] = tempy.file({cleanup: true});

// Use tempFile...

cleanup()

We could also add a .task or .cleanable function into all of them:

const tempy = require("tempy");

const [tempFile, cleanup] = tempy.file.cleanable();

// Use tempFile...

cleanup()

We could also stick with a callback-like method like in the original proposal:

const tempy = require("tempy");

tempy.file.task(tempFile => {
    // Use tempFile...
});

I think either of these strategies works best since they are all simple to understand.

The first suggestion is not desirable as it would complicate the TS types and it would be better to just add a .cleanup() method:

const tempy = require("tempy");

const tempFile = tempy.file();

// Use tempFile...

tempy.cleanup(tempFile);

The second suggestion would also not be better than what's above.

I think the last suggestion there is the best.

@sindresorhus Would it also be useful to remove temporary content when the process is killed?

Yes, but ignoring any failure.

@sindresorhus exit-hook gets us most of the way, we just need to detect when an error is a reason for exiting. https://stackoverflow.com/a/23197430/8384910

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