Add Link-diff printer and factor out common kbp document-loading code.
Fix type incompatibility
Don't diff links on score fields, tweak output format.
Include docId with link diff info.
Merge pull request #7 from rbart/link-diff

Add tools for viewing difference in linker output between runs
Merge branch 'master' into corefBestEntityMentionFinding

Conflicts:
	src/main/scala/edu/knowitall/main/DocOpenIEMain.scala
	src/main/scala/edu/knowitall/tool/document/DocumentExtractor.scala
Added debug flag on CorefDocumentExtactor