v5.0.1: Merge pull request #27 from sangnie/master

OpenIE 5.0.1 - Version 5.0.1 of the software, with a very slight improvement in precision and recall but faster speed. Also updated to use more recent sbt 1.2.1 and java 8.

OpenIE 5.0

OpenIE 5.0 improves extractions from OpenIE4.x by improving upon the noun relation extractions (RelNoun). Open IE 5.0 includes the first Open numerical relation extractor (BONIE) and also improves upon extractions from conjunctive sentences. Please refer to the ReadMe for detailed examples and the relevant papers to cite.