Merge pull request #23 from orignal/master

Merge pull request from orignal/master
Merge pull request #24 from orignal/master

delete non-responding SSU sessions
Merge pull request #25 from orignal/master

don't send session request twice
Merge pull request #26 from orignal/master

Merge pull request from orignal/master
fix VS project
Merge pull request #52 from chertov/master

fix VS project