follow xdg base dir spec. fixes #77
follow xdg base dir spec. fixes #77

spec is at http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html

q1ang/howdoi,nju520/howdoi,jasonfellows/howdoi,gleitz/howdoi,stallman-cui/howdoi,allengaller/howdoi,prasadph/howdoi,nju520/howdoi,stallman-cui/howdoi,zhengzhihust/howdoi,kv9699/howdoi,kv9699/howdoi,chrisspen/howdou,gleitz/howdoi,JackNokia/howdoi,godfreyy/howdoi,prasadph/howdoi,chrisspen/howdou,zhengzhihust/howdoi,wujinbin/howdoi,q1ang/howdoi,Xuefeng-Zhu/howdoi,JackNokia/howdoi,godfreyy/howdoi,allengaller/howdoi,Xuefeng-Zhu/howdoi,jasonfellows/howdoi,wujinbin/howdoi