Updates for handling requestTimedOut signal, multiple requests in flight and other improvements.

Modifications for the following:

- Handle the requestTimedOut signal in KQOAuthManager
- Added QMap to map a request to the generated QNetworkReply
- Fix to significantly decrease the odds of the same nonce being generated for multiple requests launched within the resolution of the system clock.
- Updates so kQOAuth will install on Windows platforms
- Updated twitter client example so Qt5 variant will properly launch a web browser.
- Documentation updates