Accessing publish queue under mutex.
Calling publish callback in a separate thread. With this will be pissible to call synchronious calls from publish callback.
Create directory for log file during installation. Fail daemon if unable to open log file.
Refactored default place of configuration files directory is used during starting executables. Now it contructs from --prefix.
Clear clients at server shutting down. There was a crash.
Refactored default place of configuration files directory is used during starting executables. Now it contructs from --prefix.
Clear clients at server shutting down. There was a crash.
Merge branch 'master' of https://github.com/treww/freeopcua
Reverted revions with mutex for publish queue at server and separate thread for publish respons at client.
Build fix of Makefile.am. Removed some dependencies from voost. Removed unused Common::Value.
Merge branch 'master' of https://github.com/treww/freeopcua

Conflicts:
	src/client/binary_server.cpp
Merge branch 'master' of https://github.com/freeopcua/freeopcua
Added ability to generate node ID if client passes ObjectID::Null.
Renamed OpcUa::Remote::Server -> Services.
Removed namespace Remote.
Renamed namespace UaServer -> Server.
opc/ua/server.h moved to opc/ua/services/services.h
Refactored OpcUa::Variant with using boosh::any. Started classes which will implement information model base. Started server object addon.
Started implementation of object high level model allowing to instantiate objects with whole tpe structure. Updated variant interface: initilizing with standard enumerations.
Merge of Subscription service.