Breaking changes

Breaking changes are in rarely used functionality, so we hope upgrade will be smooth for most users.

• Browser: The .parse() method has been renamed to .serialize() to avoid inconsistency with NodeJS version (v1.8.3 supports .serialize() too)
• Browser: Query string keys without a value used to be parsed as 'undefined', now their value is '' (empty string) (shura, Kornel Lesiński).
• NodeJS: The redirect event is called after new query string and headers have been set and is allowed to override the request URL (Kornel Lesiński)
• .then() returns a real Promise. Note that use of superagent with promises now requires a global Promise object.
  If you target Internet Explorer or Node 0.10, you'll need require('es6-promise').polyfill() or similar.
• Upgraded all dependencies (Peter Lyons)
• Renamed properties documented as @api private to have _prefixed names (Kornel Lesiński)

Probably not breaking changes:

• Extracted common functions to request-base (Peter Lyons)
• Fixed race condition in pipe tests (Peter Lyons)
• Handle FormData error events (scriptype)
• Fixed wrong jsdoc of Request#attach (George Chung)
• Updated and improved tests (Peter Lyons)