List scheduled programs by DBus call

Sending USR1 no longer works.
Reload schedules by DBus call

Sending HUP no longer works.
Move constant
Initiate reload by DBus call after update
kaede now requires dbus instead of systemd
Use system bus
Fix spec: find_scheduler_pid was removed
Generate DBus policy configuration file
travis: Fix policy configuration file generation
Add dbus-policy instruction
Fix path in comment
Manually create Introspect XML to output properties
Use dbus-send and gdbus (in glib2) in README
Add EnqueuedAt property
Merge pull request #3 from eagletmt/dbus

Add DBus interface