Only set content-type to urlencoded when data is string or URLSearchParams (#208) #210
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As per discussion in #208.
Testing coverage is very limited (changes are semantical more than functional). This is due to sinon.js mock XHR server only supporting strings (This is still the case in the newest version). In other words this PR addresses #208, but not #200. I suggest we leave #200 open, hoping someone else has an idea of how to deal with it. The tests still work (and also would have if I hadn't changed them). They're just lacking coverage.