[INTERNAL] Adds logging to Saros/I

Adds an IDEA Console logger and a file logger that
outputs to the IDEA log folder.

Change-Id: I00a69e79825c131002247c764dd12b9b2751c84b
Reviewed-on: http://saros-build.imp.fu-berlin.de/gerrit/2012
Tested-by: Jenkins CI
Reviewed-by: Christian Cikryt <c.cikryt@googlemail.com>
Reviewed-by: Arndt Lasarzik <alasarzik@gmail.com>
Reviewed-by: Holger Schmeisky <google@schmeisky.com>