adds dfu readBuffer/writeBuffer which provides reading/writing to/from buffers, abstracting over the fact DFU requires a file.
adds dfu readBuffer/writeBuffer which provides reading/writing to/from buffers, abstracting over the fact DFU requires a file.

kennethlimcp/particle-cli,kennethlimcp/particle-cli,spark/particle-cli,spark/particle-cli,kennethlimcp/particle-cli,kennethlimcp/particle-cli,spark/particle-cli,spark/particle-cli,kennethlimcp/particle-cli,spark/particle-cli,spark/particle-cli,kennethlimcp/particle-cli