Update readme.mdown

It's unclear which value to change when the example strings are identical. Folks who don't know that the first value is a key and the second a property value, might be confused.
Merge pull request #55 from jessebeach/master

Clarify the subfolder set() example.
fix encoding of UTF8 characters
Merge pull request #57 from lulezi/master

fix encoding of UTF8 characters (fixes #56)
Added .hg to ignore list

Added .hg to ignore list - for those who use Mercurial, not Git.
Merge pull request #59 from vladstudio/patch-2

Added .hg to ignore list
Merge remote-tracking branch 'origin/master' into dev