Added directory iterators. #337

Job	Run time
Linux (Static, -DDEEPSEA_SHARED=OFF)	6m 1s
Android (Debug)	12m 47s
Windows (Win32, win32, Static, -DDEEPSEA_SHARED=OFF)	8m 20s
Linux (Shared, -DDEEPSEA_SHARED=ON)	6m 4s
Android (Release)	12m 47s
Mac (Static, -DDEEPSEA_SHARED=OFF)	2m 55s
Windows (Win32, win32, Shared, -DDEEPSEA_SHARED=ON)	8m 3s
Linux (Single-Shared, -DDEEPSEA_SINGLE_SHARED=ON)	6m 25s
Mac (Shared, -DDEEPSEA_SHARED=ON)	2m 54s
Windows (x64, win64, Single-Shared, -DDEEPSEA_SINGLE_SHARED=ON)	7m 39s
Windows (x64, win64, Static, -DDEEPSEA_SHARED=OFF)	7m 43s
Mac (Single-Shared, -DDEEPSEA_SINGLE_SHARED=ON)	3m 3s
Windows (x64, win64, Shared, -DDEEPSEA_SHARED=ON)	7m 35s
Windows (x64, win64, Single-Shared, -DDEEPSEA_SINGLE_SHARED=ON)	7m 46s
	1h 40m 2s

Provide feedback