Update lib/pkp submodule for latest RECAPTCHA for Notifications.
Merge pull request #192 from ulsdevteam/notification-recaptcha-2_4

*8757* Update lib/pkp submodule for latest RECAPTCHA for Notifications.
Copyright notice tweaks
OJS 2.4.4-1 final commits
Remove doxygen from build procedure
*8763* fix Postgres SQL for timed views upgrade
*8764* Fix method usage
Merge pull request #193 from beghelli/8764-fix

8764 fix
Merge branch 'ojs-stable-2_4' of https://github.com/pkp/ojs into uls-install
Allow for CSS uploads in Journal Setup even if fileinfo mis-identifies the filetype.