* add support to disable specific tests when pass "-1"

* add checkbox on example7.html & remove unnecessary codes in js

Removed unused Fetch API support (may come back in future); Removed quirk for Safari, now treated as chromium-based browser

Added customizable grace time at beginning of tests; GET parameters can now be used in the URLs in the settings; Minor changes

Added configuration for custom compensation factor; Fixed a problem where xhr_ignoreErrors could not be changed

Merge with #29. Using standard js code style (ugh...); rewritten documentation in markdown; Added example6

Fixed a typo in worker code (fetch API version)

Abort request after onload in download test to free RAM

Implemented multistream; Implemented jitter test; Implemented Fetch API (default disabled); Added more settings; Improved code quality; Improved accuracy; Added browser-specific optimizations; Added minified version; Expanded documentation; Some bug fixes

Outputs Client IP in JSON (Requires PHP server)

getIP({"ip":"8.8.8.8"});