Gleb Smirnoff

several small fixes, see commit messages inside

support for couple more file formats: mpo, ass

small bugfix to my kqueue monitoring code

add webm/rm/rmvb support

Isolate platform independent code in monitor.c, consolidate API for starting monitor.

An extra commit slept in - a bugfix with time manipulation. You can ignore it in the scope of this pull request.

Justin, I have rebased the pull request on top of 1.3.0.

A trivial change just to test how merge requests on SF work.