Update src/or and src/common in stem's documentation
Stem has a few references to tor's pre-0.3.5 directory structure in its documentation. We should update them based on the new subdirectories in 0.3.5 and later.
Stem has a few references to tor's pre-0.3.5 directory structure in its documentation. We should update them based on the new subdirectories in 0.3.5 and later.