+ Added ServerMap::get(string, NodeInfo*)
 * Move file_path_to_hash to PathUtil
 * Move generating index path and partition path to common/path_util.h
 * Extract get index path to common/path_util
Merge pull request #54 from vsfs/server_map_get_by_path

Added ServerMap::get(string, NodeInfo*)
Merge pull request #55 from vsfs/path_util

Put path related functions into common/path_util.h
 * Fixed conflict PR
Merge branch 'master' into trans_obj_to_path

Conflicts:
	vsfs/client/vsfs_rpc_client.cpp
	vsfs/masterd/namespace.cpp
 * Fixed conflicts from other pulls