Don't compress files by default. --compress must be provided in order to compress files. No need for --no-compress option.

Regardless of whether you provide --compress or --no-compress, `sc upload` proceeds with compressing the file. This change makes `sc upload` not compress by default. Soundcloud limits users by time, not file size, so my argument is to not compress by default and upload the original file. Bandwidth may be a concern, but then you can use `sc upload --compress`! Also, I don't believe Soundcloud compresses files by default (not in regards to streaming, but when somebody hits the download link on your track) -- I may be wrong here.

I'm also up for making it compress by default, but make the --no-compress option work and resend a pull request if you'd prefer. Just let me know.

Anyways, thanks for working on this. I just stumbled across this today -- looks good and simple.