Add a tool to dump data from ninja logs

Sample output:

common/simple_mem_pool.o: #deps: 22, deps mtime: 1371587514, target mtime/restat_mtime: 1371587514/0
    common/simple_mem_pool.c
    common/logger.h
    common/common.h
common/conf/component_types_conf_auto.h: deps not found, target mtime/restat_mtime: 1365451579/1371390939
common/sys_thread.h: deps not found, target mtime/restat_mtime: 1364199518/-1

@nico:
Notice that I've modified your patch in-place after cherry-picking as I had to adjust it heavily to origin/master anyway. Let me know if you mind staying the commit 'author'.