Update README.md
Fixed too eager publisher url caching.
Merge pull request #185 from xi-project/publisher-too-eager-fix

Fixed too eager publisher url caching.
Fixed mongodb upgrade path.
Fixed Doctrine performance (not eager fetching of resources)
Merge pull request #186 from xi-project/doctrine-backend-performance-fix

Doctrine backend performance fix
Fixed bug in after upload (data going missing)
Merge pull request #187 from xi-project/after-upload-bug

Fixed bug in after upload (data going missing)
Merge remote-tracking branch 'origin/master' into cache

Conflicts:
	library/Xi/Filelib/Publisher/Publisher.php