Add timeout option

[GoogleCodeExporter]

Consider adding a timeout here so that if the host is down, the thread doesn't 
hang for a long time:
https://code.google.com/p/pynetdicom/source/browse/source/netdicom/fsm.py#22

Original issue reported on code.google.com by agrothberg on 12 Feb 2015 at 7:23

[GoogleCodeExporter]

This is my current solution: 
https://github.com/cancan101/pynetdicom/commit/6beca2fe04671c01e4e1297361192c777
cd78614

Original comment by agrothberg on 12 Feb 2015 at 7:40

[GoogleCodeExporter]

Updated: 
https://github.com/cancan101/pynetdicom/commit/8e6ad3e852362d22f209b03eb782d9b55
4b27826

Original comment by agrothberg on 13 Feb 2015 at 10:43

[naggie]

@cancan101 did this make it to master here?