Add a comment to the protocol specification about iterator key type.

(hat tip to Petr Yanovich).
Remove array from tarantool.rb
Merge branch 'stable'
Fix #327: Convert box.counter to space:inc() and space:dec()
Merge box/lua/misc.lua into src/lua/init.lua
Merge branch 'master' of https://github.com/tarantool/tarantool