Bug 1061809 - [mozversion] Update retrieval of application information due to upcoming Mac signing changes. r=dhunt

---
 testing/mozbase/mozversion/mozversion/__init__.py  |  3 +-
 testing/mozbase/mozversion/mozversion/errors.py    | 26 ++++++++++
 .../mozbase/mozversion/mozversion/mozversion.py    | 58 ++++++++++++----------
 testing/mozbase/mozversion/tests/test_binary.py    | 22 ++++++--
 testing/mozbase/mozversion/tests/test_sources.py   | 17 ++++---
 5 files changed, 90 insertions(+), 36 deletions(-)
 create mode 100644 testing/mozbase/mozversion/mozversion/errors.py