Etcher (32-bit)

What's new in this version:

Features:
- Display actual write speed
- Add the progress and status to the window title
- Add a sudo-prompt upon launch on Linux-based systems
- Add optional progress bars to drive-selector drives
- Increase the flashing speed of usbboot discovered devices
- Add eye candy to usbboot initialized devices
- Integrate Raspberry Pi’s usbboot technology

Fixes:
- Fix bzip2 streaming with the new pipelines
- Remove Linux elevation meant for usbboot
- Fix LIBUSB_ERROR_NO_DEVICE error at the end of usbboot
- Gracefully handle scenarios where a USB drive is disconnected halfway through the usbboot procedure
- Make sure the progress button is always rounded
- Fix permission denied issues when XDG_RUNTIME_DIR is mounted with the noexec option
- Fix Etcher being unable to read certain zip files
- Fix “Couldn’t scan the drives: An unknown error occurred” error when there is a drive locked with BitLocker
- Fix “Missing state eta” error when speed is zero
- Fix “Stuck on Starting…” error
- Fix situations where the process would get stuck while flashing

Misc:
- Add the Python version (2.7) to the CONTRIBUTING doc
- Remove duplicate debug enabling in usbboot module
- Update Electron to v1.7.9
- Retry ejection various times before giving up on Windows