refactor role, fix #1

client/defaults/main.yml

client/files/icedove/defaults/pref/asta.js

client/files/icedove/defaults/pref/vendor.js

client/files/iceweasel/defaults/pref/local-settings.js

client/files/iceweasel/mozilla.cfg

client/tasks/configuration.yml

client/tasks/kde.yml

client/tasks/main.yml

client/tasks/proprietary.yml

client/tasks/software.yml