feat(README): add some notes on the dbus library
chore(dbus): add comments
chore(dbus/methods): go fmt
chore(dbus/dbus_test): add a go doc to the test
feat(dbus/dbus_test): add a constructor test for dbus
feat(dbus): move JobRemoved into core

To have the library feel syncronous we need to subscribe to JobRemoved
in the core dbus object.
feat(dbus): add test for starting and stopping units
feat(dbus/subscription): add some initial tests
chore(dbus/subscription): cleanup some comments
feat(dbus/subscription): add Unsubscribe
fix(dbus/subscription): cleanup the subscription test
chore(dbus): cleanup comment and formatting nips
fix(dbus): add fixtures for the tests
Merge pull request #22 from philips/more-dbus-tests

More dbus tests