Overview of changes from libfolks 0.6.6 to libfolks 0.6.7
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Bugs fixed:
* Bug 666310 — Crash in Tracker backend by unsetting an entry in a read-only map
* Bug 666528 — Can't convert from type 'GFile' to 'gchararray'
* Bug 666540 — Segfault on empty e-mail addresses with potential match
* Bug 659610 — Support code coverage report generation
* Bug 657063 — Allow to pass a command to folks-inspect
* Bug 667410 — A second instance of the aggregator only fetch a small subset of
  my contacts
* Bug 667535 — persona created by tpf_persona_dup_for_contact() outlives its
  TpContact
* Bug 670196 — Disable GLib deprecation warnings
* Bug 668415 — Port to Vala 0.15.x

API changes:
* Add PostalAddress.is_empty() and Role.is_empty()