Update base URL for EZID API

I didn't bother to make this a configurable parameter, since we expect
it to be relatively stable.
Remove trailing slash

Keeping the URL consistent with what was already in the code.
Improve text on homepage "Popular" tab
Add recommendation to cite DOI in URL form
Merge pull request #521 from datadryad/ezid-update

Update EZID base URL
Merge pull request #525 from datadryad/popularity-titles

Improve text on homepage "Popular" tab
Added CUP to list of members
Merge pull request #529 from laurawendell/patch-50

Added CUP to list of members
Merge pull request #527 from saramannheimer/patch-18

Add recommendation to cite DOI in URL form
Update messages.xml
Merge pull request #530 from saramannheimer/patch-19

Added text re: urgent requests to feedback page
Changed title of JOPHD
Merge pull request #531 from laurawendell/patch-51

Changed title of JOPHD
Catch possible exceptions when bean is initialized for DOI Database
correct log case
Merge pull request #533 from datadryad/doi-db

Catch possible exceptions when bean is initialized for DOI Database
Merge branch 'dryad-master' into journalcovers
Add sized covers for BMCEcology, BMCEvolBiology
Show covers for BMC Ecology, BMC Evolutionary Biology