Initial commit
Stub-implementation of the SharedResource class
Boost.Test is used for tests now. Variadic constructor added for the SharedResource class.
SharedResource<T>::Accessor class stub is implemented
Copy and move implemented for SharedResource<T>::Accessor
SharedResource<T>::Accessor::isValid method added
Test for SharedResourse::Accessor::isValid method added
Tests for SharedResource dereferencing
Dereferencing operators implemented. Tests fixed.
Concurrency test added