update Sara's title
Prevent null pointer exception when DOI has no metadata

In this case, EZID will likely throw an error due to insufficient
metadata, but we should be catching the problem at a different location.
Improve error handling for EZID registrations
Update integration settings for Biodiversity Data Journal
Update email list for BDJ
Merge pull request #461 from datadryad/doi-registration

Robustness of DOI registration
Merge pull request #460 from datadryad/curator-title

update Sara's title
correct review setting for Ecology & Evolution
Correct integration error due to lowercased journal ID

The code that processes a journal metadata file was not locating the
files due to the recent change of journal IDs to lowercase.
Correct typo
Update BMJ Open Cover Image
Add cover images for Elementa
Replace GMS with Elementa in recently integrated
Add cover image display for Elementa
Update submit_datapackage_confirm
Update payment_approved
Merge pull request #473 from saramannheimer/patch-6

Added more official details to receipt
Merge pull request #472 from saramannheimer/patch-5

Updated language to explain credit card procedure
Merge pull request #471 from datadryad/recently-integrated

Add cover for Elementa and insert into recently integrated
Merge pull request #470 from datadryad/bmj_open_logo

Update BMJ Open Cover Image