v3.2.0

• Added .timeout({response:ms}), which allows limiting maximum response time independently from total download time (Kornel Lesiński)
• Added warnings when .end() is called more than once (Kornel Lesiński)
• Added response.links to browser version (Lukas Eipert)
• btoa is no longer required in IE9 (Kornel Lesiński)
• Fixed .sortQuery() on URLs without query strings (Kornel Lesiński)
• Refactored common response code into ResponseBase (Lukas Eipert)