Add arrow -- Related to #1752
Copy & paste error: If the cache_size was > 64 GB, it was reduced to 16 GB instead of 64 GB.
Over-the-shoulder review done by @jdoliner.
Merge branch 'next' of github.com:rethinkdb/rethinkdb into next
Merge branch 'michel_1753_style' into next
Check for args before checking args.cb -- Related to #1754
Merge branch 'next' into sam_style