* pool: fix specs

  * pool: minor optimization for internal state
  * pool: optimize load balancing
  * pool: specs fix
  * pool: start new connections in a separate function

 * add _socket:info_namespace/3 API call

  * fix "generation" option handling
  * fix function spec
  * minor fix: use existing macros instead of magic numbers

 * implement command line tool for Aerospike info requests

  * do not decode info responses - keep info call simple
  * protocol minor fix
  * improve erlang specs
  * deploy header files with erlang application

 * extend info protocol with custom commands

 * implement connection pool process

  * _socket: monitor caller process
  * extend unit test
  * _socket: minor fix
  * satisfy dialyzer
  * handle Aerospike disconnection