Add test code to Arangos big comparison

[ShalokShalom]

ArangoDB added an imho interesting comparison to its homepage and the comment section is full with requests for dgraph:

https://www.arangodb.com/2018/02/nosql-performance-benchmark-2018-mongodb-postgresql-orientdb-neo4j-arangodb/

Based on the results with neo4j on your own blog and this results is it obvious that dgraph might probably provide super results.

This a chance to make dgraph even more popular :D

[ShalokShalom]

Note: neo4j's recently added chances increase their performance and their memory usage.

Dgraph will probably still perform remarkable speedier as dgraph and probably also as other databases here. :)

[manishrjain]

We'd love to add, but we're pretty swamped at the moment. So, this integration would have to come from the community.

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