proofread guide-build-a-recommendation-engine
Merge pull request #39 from whatSocks/guide-build-a-recommendation-engine

proofread guide-build-a-recommendation-engine
Merge branch 'gh-pages' of https://github.com/neo4j-contrib/developer-resources into gh-pages
proofread guide-clustering-neo4j, some java edits got in there too
graph-db-vs-nosql
proofread graph-db-vs-rdbms
proofread guide-data-visualization