• Convert all headers to lowercase when reading and setting. Fixes #167.
• Ensure request URLs are urlencoded. Fixes #171.
• Fixed parse_response behaviour when set via defaults. Fixes #169.
• Handle japanese/chinese chars correctly when building multipart bodies. Fixes #97.
• Handle and bubble up error events that occur at decompressor level (#172).
• Fixed open file descriptor bug (#181) when using output option.