> This work was supported in part by the NSF (CCF-0954024, CCF-1116289, CDI-1124931, EF-1124931); Air Force (FA8750- 15-2-0075); Virginia Commonwealth Fellowship; Jefferson Scholars Foundation; the Virginia CIT CRCF program under grant no. MF14S-021-IT; by C-FAR, one of the six SRC STARnet Centers, sponsored by MARCO and DARPA; a grant from Micron Technology.