Update ArangoDB implementation and use projection options

[sandrokeil]

No description provided.

[prolic]

@sandrokeil see

event-store-benchmarks/bench.sh

Line 8 in 0be21e3

while [[ ${1} ]]; do

I have to change this line to while [ ${1} ]; do, otherwise the script won't run.

[sandrokeil]

@prolic Fixed.