1.7.1

Bug Fixes

• debug-runner: support asynchronous tests in the debug runner (a36f3eb), closes #2811
• file-list: Stop polluting global environment with core-js (0988022)
• preprocessor: renamed handeFile to readFileCallback (92a8c81)
• preprocessor: retry if fs.readFile fails (4b60513)
• preprocessor: throw if retry fails (2789bf5)

Features

• ci: disable testing of node versions below 4 (ec92ea9)
• client: log global error stack trace (523d608), closes #2812
• config: remove polling usage (b0f41c7), closes #2669
• deps: add support for node@8 (7feaee3), closes #2754
• deps: update socket.io to 1.7.4 to avoid issue with ws[@1](https://github.com/1).1.2 (264442b), closes #2593
• watcher: Debounce autoWatchBatchDelay (2f8c049), closes #2331