Circonus

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**Bug fixes**

- Avoid selecting ``df`` metrics other than ``df_complex`` when creating disk
free graphs.

+++++++++++++++++++

**Improvements**

- Change the ``collectd`` client interface to take an explicit check bundle to
create graphs from rather than naïvely using the *first* ``collectd`` check
bundle found for ``target``.

- Refactor the ``datetime_to_int`` method from ``Annotation`` to be a function
in ``util``.

+++++++++++++++++++

**Bug fixes**

- Remove errant ``df`` from custom graph title.

+++++++++++++++++++

**Bug fixes**

- Fix optional custom titles for all ``collectd`` graphs.

+++++++++++++++++++

**Improvements**

- Add optional custom titles for all ``collectd`` graphs.

+++++++++++++++++++

**Improvements**

- Add function for updating the ``status`` of each metric in a list of
metrics.