When printing IPython version, print the actual version.

Currently we describe any 0.11 compatible IPython version as 0.11; this is
confusing if the actual version is later.  Print the actual version.
Provide GUI main loop integration through cross-thread signals/callbacks

Run the XML-RPC server in its own thread, communicating with the main thread
using GUI-dependent cross-thread signals or callbacks; this allows running a
fully responsive GUI main loop in the main thread.
TISTUD-3539: categorized Pydev update site correctly.
try to get build working under Eclipse 4.3M7