v4.1.0

Added

• Support for tracking sessions and overall crash rate by setting sessionTrackingEnabled to true.
  In addition, sessions can be indicated manually using bugsnagClient.startSession() (#296)
• user and metaData can now be supplied in configuration object (#299)
• Bower and jspm support has been added as a result of #297 and some additional configuration

Changed

• dist directory (built assets) are now stored in git (#297)