0.9.0

• Rewritten http_output to be way more faster: workers pool scale dynamically. You can still use fixed workers pool by using -output-http-workers option.
• Added simple url rewriting
• Add ability to filter output_http by headers/url via regex
• Fixed file replay speed issues
• Added docker development environment
• Fixed compilation issues caused by elasticgo
• Switched to use go 1.3.3 (no changes needed)