Added DefaultWebProxy to WebRequest to use IE default settings.
This will allow also to pass a proxy that requires authentication.
Merge pull request #729 from virtualrobotix/master_proxy

Added DefaultWebProxy to WebRequest to use IE default settings.
code cleanup.
ConfigBatteryMonitoring: Added VRBRAIN4 board pins and corrected VRBRAIN 5 and VR Micro drop down auto-select
FirmwareUpload: VRBRAIN added board detection for VRBRAIN 4.
Changed message box for VRBRAIN 4 firmware upload.
Changed message box for VRBRIN5 boards after upload.