Don't barf on an empty or whitespace-only journal file, resolves #755.
Better API, duh.
Merge pull request #759 from mozilla-services/empty-logstreamer-journal

Don't barf on an empty or whitespace-only journal file, resolves #755.
Always use accessors to get message field values. Resolves #761.
Merge pull request #764 from mozilla-services/fix-multidecoder-type

Always use accessors to get message field values. Resolves #761.
Adjust text report to work w/ the JSON that it actually receives.
Resolves #762.
Merge pull request #765 from mozilla-services/fix-stdout-reports

Adjust text report to work w/ the JSON that it actually receives.
Merge branch 'versions/0.5' into dev