update:: directive date handling anomaly

[tze-dev]

When adding ..update:: directive in a post using the date format as per defined in conf.py, e.g.,

.. update:: Dec 04, 2015
    Added snapshots performance benchmark and analysis :ref:`sec-behaviour-of-vsan-vm-snapshots`.

ablog produced the following errors (note that this only occurs if I add ..update:: directive. The same date format works without issue under ..post:: directive),

    Running Sphinx v1.3.3
    Initializing Basicstrap theme directives
    loading pickled environment... not yet created
    building [mo]: targets for 0 po files that are out of date
    building [dirhtml]: targets for 14 source files that are out of date
    updating environment: 14 added, 0 changed, 0 removed
    reading sources... [100%] vmware-snapshot-overview
    Exception occurred:
      File "/home/lxcuser/sphinx-doc/lib/python3.4/site-packages/ablog/post.py", line 187, in _get_update_dates
        (update_node['date'], docname, post_date_format))
    ValueError: invalid post update date (Dec 04, 2015
    Added snapshots performance benchmark and analysis :ref:`sec-behaviour-of-vsan-vm-snapshots`.) in vmware-snapshot-overview. Expected format: %b %d, %Y
    The full traceback has been saved in /tmp/sphinx-err-hsqqb2_s.log, if you want to report the issue to the developers.
    Please also report this if it was a user error, so that a better error message can be provided next time.
    A bug report can be filed in the tracker at <https://github.com/sphinx-doc/sphinx/issues>. Thanks!

Attached is the actual error log produced by Sphinx error.txt

[abakan-zz]

I revised update date parsing. You could get the fixes with pip install https://github.com/abakan/ablog/archive/devel.zip. Let me know if the issue persists.

[tze-dev]

Thanks Ahmet. Confirmed that it's fixed now.