Merge pull request #5 from deztructor/master

[subscriber] onChanged is invoked in other thread
refactoring: CKitProperty->Property

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
refactoring: extracting Actor to separate header

preparing to move it out to separate library

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[cmake] link with cor

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
contextkit-monitor: exit QCoreApplication on signal

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>
[subscriber] actor thread should quit before application

Signed-off-by: Denis Zalevskiy <denis.zalevskiy@jolla.com>