UnauthorizedAccessException on deleting/creating config

[guryanovev]

Steps to reproduce:

• setup config (without watching);
• delete config directory;
• try to create the same config directory with content.

(see regression test Test_DeleteFileWhileNoWatching_ShouldNotFail)

Important:

• file system watching should setup only on WatchForConfig method call (not in constructor).
• file watching should not block files from deleting/creating.