Normalized line-endings.
Was mixed, mostly LF, so a few CR-LF was replaced with LF.
Improved MutexMultiProcessFileAppender to enable the mutex to be shared among all processes and sessions.

The original implementation created a mutex with a default security descriptor (the primary or impersonation token of the creator), which prevented it from being shared between e.g. IIS application pools with different identities. It also didn't use the global kernel object namespace, preventing the mutex from being shared between processes in different sessions.
Merge pull request #226 from cjberg/shared-mutex-bugfix

Shared Mutex Improvement