Graphs fixes & D3 Update

General Graph fixes:

- Fill the gap between History/Change Time window and a previous request with the fetching stats popup.
- Disable history controls when changing time window
- Fix graphs timestamps for small displays
- Fixed an issue with multiple requests for stats while machine is being destroyed.

Also udpated d3 to the latest version: 3.4.3 (minified version 100kb less than previous one)