Long overdue maintenance

Due to some great contributions I'm happy to announce a new release of http-proxy containing numerous bug fixes, feature additions and documentation improvements. Thanks to all who contributed for their patience and willingness to contribute despite perceived stagnation in activity in the project. I welcome all contributions and those who are interested in getting more involved with the project. Below I will highlight the changes that landed in the latest version but you can find the full diff of the changes in #1251

• Add option to rewrite path of set-cookie headers. @swillis12
• Add option for overriding http METHOD when proxying request @AydinChavez
• Feature: selfHandleResponse for taking responsibility in returning your own response when listening on the proxyRes event. @cpd0101 @guoxiangyang
• Add followRedirects option @n30n0v
• Document timeout option @jlaamanen
• Fix documentation typos @carpsareokiguess
• Document buffer option @jonhunter1977
• Include websocket non-upgrade response instead of just closing the socket. Allows auth schemes to be possible with websocket proxying. @Tigge
• Stop using the writeHead method explicitly and let node handle it internally to prevent thrown errors @jakefurler
• Be more defensive in handling of detecting response state when proxying @thiagobustamante