~ Ignore profiling files.
~ merge mmap-fixed package into bittorrent.

reason: mmap-fixed is pretty useless out of scope of bittorrent, at
least i don't think that it'll be used some time that way. Moreover we
can hide some internal stuff and simplify interface and simplify user
code. Using mmap-fixed we can provide Storage datatype with all
necessary operations needed to keep torrent content in memory of FS.

Also that seems pretty annoying to merge this 2 repos into one using git
merge(there are not so many stuff anyway), so I just did that
manually. :<
~ Fix typo in dirname.