Added: ability to take some of stats on FreeBSD.
Added: link to FreeBSD free mem script.
Merge pull request #56 from anakryiko/freebsd-stats

FreeBSD free memory stats and don't make too much noise when no procfs is there (or is not mounted on FreeBSD).
fix README
ignore .DS_Store files
Merge branch 'dev'
Merge pull request #57 from t3hnar/master

Minor improvements