Added signatureVersion to S3 init to support newer regions

[mikehhhhhhh]

Only older regions support the older V3 signing, which leads to the following error when trying to upload a file;

The authorization mechanism you have provided is not supported. Please use AWS4-HMAC-SHA256

V4 should be supported everywhere.

[nrempel]

thanks @mikehhhhhhh I'll take a look at this asap

[mikehhhhhhh]

I needed the ability to pass parameters to S3.

Particularly ContentType so files are displayed inline in the browser rather than downloaded.

I've added an extra parameter for all put methods that takes an object and adds it to the S3 upload request options.