Add request data

[vincentrolfs]

• Remove call to Bootstrap::exceptionHandler and do the boilerplate work ourselves in order to be able to send more data to error reporting
• Send the following data to error reporting (in addition to what we have always sent):
  • User id
  • Request URL
  • Request method (GET, POST, ...)
  • User agent
  • Referrer URL
  • Client IP
• Enable users to supply additional context data as they wish