added Cypher transaction warning to documentation for https://github.com/neo4j/neo4j/issues/1406
added Cypher transaction warning to documentation for https://github.com/neo4j/neo4j/issues/1406

nicolewhite/py2neo,nicolewhite/py2neo,pombreda/py2neo,technige/py2neo,fpieper/py2neo,nicolewhite/py2neo,pombreda/py2neo,fpieper/py2neo,technige/py2neo,fpieper/py2neo,technige/py2neo,pombreda/py2neo,nigelsmall/py2neo,nigelsmall/py2neo