Don't crash when unable to save a click (fixes OPS-1357)
Merge branch 'olefloch/OPS-1490/use_pywork4core' into olefloch/OPS-1357/saving_clicks_isnt_critical

Conflicts:
	django_short_urls/models.py
Split models tests into separate files
Unittest the Clicks model
Full coverage!
Oops.

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Merge branch 'olefloch/OPS-1490/use_pywork4core' into olefloch/OPS-1357/saving_clicks_isnt_critical
Merge branch 'master' into olefloch/OPS-1357/saving_clicks_isnt_critical
Merge pull request #14 from olivierlefloch/olefloch/OPS-1357/saving_clicks_isnt_critical

Don't crash when unable to save a click (fixes OPS-1357)