Log message:
Add SHA512 digests for distfiles for databases category

Problems found with existing distfiles:
	distfiles/D6.data.ros.gz
	distfiles/cstore0.2.tar.gz
	distfiles/data4.tar.gz
	distfiles/sphinx-2.2.7-release.tar.gz
No changes made to the cstore or mariadb55-client distinfo files.

Otherwise, existing SHA1 digests verified and found to be the same on
the machine holding the existing distfiles (morden).  All existing
SHA1 digests retained for now as an audit trail.

Log message:
Set maintainership to bartoszkuzma, didn't notice his wip/php-mongo before.

Log message:
Import the PECL mongo 1.6.9 module as databases/php-mongo.

Provides an interface for communicating with the Mongo database in PHP.