Merge pull request #2 from benjamin7062/master

Upgrade AwesomeWebsocket version and enable keepalive on client
Upgrade version of AwesomeWebsocket

- The version indicated below represents the next version of
  AwesomeWebsocket that is not yet released.  If the version of
  AwesomeWebsocket gets rev'd to address this bug:

  https://code.google.com/p/chromium/issues/detail?id=425236

  I suggest we use that version for core-custom-event-client
  to prevent memory leaks in Windows.