version 1.5, develop version
Merge branch 'master' into develop
Merge branch 'master' into develop
add list command(lpush lpop rpush rpop)
change atol to atoll
1. fix bug 2. add llen for list
use writebacth to do atomic write
change %ld to %PRId64
add one marco
destroy writebatch to fix memory leak
remove blank lines and useless header include
docs update and merge remote-tracking branch 'aw/develop' into develop

Conflicts:
	src/rl_list.cpp
update Makefile and leveldb
bugfix for distclean target
-r option for repairing db
shutdown command
docs update
doc for -r option
r1.6-rc