Changed XDG data dir to '~/.local/share'

The XDG data dir should default to '~/.local/share' if XDG_DATA_HOME is
unset. This is stated under the 'Environment variables' header here:

http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html
Merge pull request #9 from Pyrohh/master

Changed XDG data dir to '~/.local/share'