Fix symlinks

add missing xdg directory if you symlink
shellshape to ~/.local/share/gnome-shell/extensions/shellshape@gfxmonk.net
remove manual install instructions, they don't work any more (#101)
include schemas in 0install tarball

created 0.5.5 (which is 0.5.4 with the schemas included), and created a new 0.5.3 tarball

Fixes #103
Merge remote-tracking branch 'upstream/master'
Added "settings" menu item, misc fixes
prefs.js: disable shellshape logging to avoid clobbering the real shellshape log
Merge remote-tracking branch 'upstream/master'