Convert file IO to raw mode

Switching from cooked to raw mode to reduce the number of processes created
per-request. Cooked mode creates at least 1 process per FD which can become
an issue if the bookshelf server receives a sudden burst of traffic.
Incrementing bookshelf.app VSN
Tuning default values to handle high load
Use R15 compatible ERL_MAX_PORTS env var to increase max ports

The +Q flag to erl is new in R16.
Merge branch 'kas/raw_mode'