Url encode all strings, not just unicode

[guitard0g]

I've been having some issues with url encoding requests in an API that makes use of Unirest. It seems that params are not properly encoded if they are already in utf-8 form so characters like "+" and "," do not get escaped properly.

[EllieTheYeen]

This is good to have fixed. I just had this bug with data that corrupted as it contained a plus and I opened an issue

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