Changes so this can be added to the Arduino 1.5+ library manager

Added sending "Connection: close" header to fix hang when talking to …

…some servers (first spotted with Xively's servers)

Installation instructions updated to use releases area

Last version before the API tweaks that came out as a result of the d…

…iscussion on the Arduino developers list (as part of the move to making this part of the main Arduino distribution)

Release which works with the Arduino1.0 Beta1 version of the IDE