Description of problem:
Installation of hamster-time-tracker on my F23 system didn't work due to a missing dependency on python-gi-cairo, which is provided by python-gobject-3.18.2-1.fc23.x86_64

Version-Release number of selected component (if applicable):
0.3.rc1.fc23

How reproducible:
Always, I'd presume.

Steps to Reproduce:
1. run: dnf install hamster-time-tracker 
2. run: hamster

Actual results:

/usr/lib/python2.7/site-packages/hamster/lib/configuration.py:33: PyGIWarning: GConf was imported without specifying a version first. Use gi.require_version('GConf', '2.0') before import to ensure that the right version gets loaded.
  from gi.repository import GConf as gconf
Traceback (most recent call last):
  File "/usr/bin/hamster", line 387, in <module>
    hamster_client.overview()
  File "/usr/bin/hamster", line 152, in overview
    self._launch_window("overview")
  File "/usr/bin/hamster", line 143, in _launch_window
    getattr(server, window_name)()
  File "/usr/lib64/python2.7/site-packages/dbus/proxies.py", line 70, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib64/python2.7/site-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib64/python2.7/site-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Python.KeyError: Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/dbus/service.py", line 707, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/bin/hamster-windows-service", line 38, in overview
    def overview(self): dialogs.overview.show(self.app)
  File "/usr/lib/python2.7/site-packages/hamster/lib/configuration.py", line 149, in show
    dialog = self.get_dialog_class()(parent, **kwargs)
  File "/usr/lib/python2.7/site-packages/hamster/overview.py", line 394, in __init__
    self.fact_tree = FactTree()
  File "/usr/lib/python2.7/site-packages/hamster/widgets/facttree.py", line 219, in __init__
    self.date_label = Label(10, 3)
  File "/usr/lib/python2.7/site-packages/hamster/widgets/facttree.py", line 59, in __init__
    self.layout = pangocairo.create_layout(self._label_context)
KeyError: 'could not find foreign type Context'

Expected results: It just works.


Additional info:
Installing python-gobject-3.18.2-1.fc23.x86_64.rpm fixes the problem. The hamster-time-tracker rpm should probably depend on this.