start implementation of event support, small cleanup and work on ubscription api
theoretical implementation of DeleteMonitoredItems
add deletemonitoreditem in opc_tcp processor
theoretical fix to MonitoringFilter serialization, move monitoringitens implementation to correct cpp file
default value while parsing qualifiedname
phase 1 to add support for events
fix errors discoverd while checking compatibility with node-opcua implementation
do not create new objects for every service call
more work on subscription interface
fix bug: remove sub from internal list when deletesubscription is called so that we do not try to delete them 2 times
add missing event files
Merge pull request #9 from oroulet/master

add partial support for filters, theoretical event support, more work on subscription interface