v1.5.0

• encode array values as key=1&key=2&key=3 etc... (aalpern, Davis Kim)
• avoid the error which is omitted from 'socket hang up'
• faster JSON parsing, handling of zlib errors (jbellenger)
• fix IE11 sends 'undefined' string if data was undefined (Vadim Goncharov)
• alias del() method as delete() (Aaron Krause)
• revert Request#parse since it was actually Response#parse