Basic renaming of log files.
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Merge pull request #265 from benfitzpatrick/gedit-syntax

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Merge pull request #264 from arjclark/66

#66: renaming of log files.
Updated change log.
Removed some cruft (see task log root change).
Minor change to doc index formatting.
task_batcher.item_failed_hook: fix method signature.
Merge pull request #267 from matthewrmshin/task_batcher.item_failed_hook.signature

task_batcher.item_failed_hook: fix method signature.