Merge pull request #45 from elifesciences/tweaks

Fix automatic SES email recipient verification in AdminEmailHistory acti...
Merge pull request #48 from elifesciences/tweaks

Tests for activity, optionally specify an activityId to separate tmp dir...
First refactor of filesystem provider for more consistent functions.
Test for unzipping multiple files with filesystem provider.
Merge pull request #50 from elifesciences/filesystem

Filesystem provider refactor, zip files with multiple files, and test for multiple files.
UnzipArticleSVG activity with unzipping tests.
Explicitly set S3 object Content-Type in UnzipArticleSVG activity.
PublishSVG workflow and starter, small test function rename.
cron_NewS3SVG cron starter to watch for new SVG files.
Merge pull request #51 from elifesciences/publish-svg

Publish svg
Bug fix SVG zip files with one file as contents, with test.
Merge pull request #52 from elifesciences/publish-svg

Bug fix SVG zip files with one file as contents, with test.