Document new Importer plugin

[santo-it]

Describe that now users that would like to migrate from neo4j can use, in addition to the command line tool Neo4j to OrientDB Importer, that makes use of embedded connections, also the new graphical user interface that has been introduced from version 2.2.25 in Studio, that makes use of bolt and remote connections to Neo4j.

Take screenshot of the new graphical user interface, and document them in the chapter Studio.

[santo-it]

In 3.0:

• Studio chapter where the screenshot can be documented:
  http://orientdb.com/docs/3.0.x/studio/backups-imports-exports/Studio-Neo4j-Importer.html

• Section to edit to cite the new strategy as well:
  http://orientdb.com/docs/3.0.x/neo4j-to-orientdb-importer/

In 2.0:

• Add new section in the Studio Chapter: http://orientdb.com/docs/2.2.x/Studio-Home-page.html

• Section to edit to cite the new strategy as well:
  http://orientdb.com/docs/2.2.x/OrientDB-Neo4j-Importer.html