addSiteLink and addNewSiteLink
Merge pull request #110 from wmde/addNewSiteLink

[WIP] addSiteLink and addNewSiteLink
Update release notes
Add PropertyDataTypeLookup (moved here from WikibaseLib)
Merge pull request #98 from wmde/typelookup

Add PropertyDataTypeLookup (moved here from WikibaseLib)
Update PropertyDataTypeLookup.php
Make methods in ClaimList Thiemo-compliant
Fix docs after backport to 0.8
Fix in rel notes
Merge pull request #114 from wmde/claimlistrename

Make methods in ClaimList Thiemo-compliant
Add extra regression test
Do not alter behaviour of Item::addSiteLink
Re-add Entity::isEmpty
Re-add Entity::clear
Fix behaviour regression
Use containsOnly assertion
Merge pull request #117 from wmde/contains-only

Use containsOnly assertion
Merge pull request #116 from wmde/readd

Re-add methods that are still needed after all
Re-add description for on Special:Version

Got killed when we removed the i18n stuff
Re-add Property::newEmpty for now