Limited Browser Support and Better Retry Logic

• Browsers are now supported by installing without optional dependencies.
  • A future release will enhance this by removing the SDK's dependency on Winston. Once that is done, the sdk should work within NodeJS and Browsers simply by running npm install.
• Retry logic has been enhanced to handle network outages.
• Retries use random jitter to back off instead of exponential delay.
  • minimumRequestRetryRandomDelay and maximumRequestRetryRandomDelay optional configuration parameters have been added to control wait time.