neo4j-2 indexes: rename legacy index namespace to legacyindex
neo4j-2 indexes: move rel.createUnique to rel.legacyindex.saveUnique
neo4j-2 indexes: factor out saveUnique from tests
neo4j-2 indexes: factor out old saveUnique/createUnique functions
neo4j-2 indexes: move index.js to legacyindex.js
neo4j-2 indexes: refactor index refrences on seraph to legacyindex
neo4j-2 indexes: updated refrences to index in batching tests
neo4j-2 indexes: refactor references to index in query tests
neo4j-2 indexes: refactor references to index in root tests
neo4j-2 indexes: move all references to index in docs to `legacy index`
0.9.0