Erlang performance changes

Cowboy now spawns 5k listeners
Cowboy's emysql connpool now starts with 5k connections to match my.cnf's incoming limit
Cowboy's VM now has additional flags: "+K true +sbwt very_long +swt very_low"

Elli's emysql connpool now starts with 5k connections to match my.cnf's incoming limit
Elli's VM now has additional flags: "+K true +sbwt very_long +swt very_low"