feat: implement usbboot adapter (#1686)

This commit installs `node-usb` v1.3.0 from GitHub, since that version
was never published to NPM, and is the only one that works with Visual
Studio 2015 (see https://github.com/tessel/node-usb/issues/109).

The usbboot communicates with a Raspberry Pi / Amber through USB and
eventually mounts it as a block device we can write to.

This feature bundles bootcode.bin and start.elf from the original
usbboot implementation.

The flow is the following:

- On each scan, the usbboot scanner will try to get a usbboot compatible
  USB device to the next "phase", until they are all transformed to
  block devices the user can flash to as usual

Change-Type: minor
Changelog-Entry: Integrate Raspberry Pi's usbboot technology.
Fixes: https://github.com/resin-io/etcher/issues/1541
See: https://github.com/raspberrypi/usbboot
Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>

lib/blobs/usbboot/LICENSE

@@ -0,0 +1,30 @@
+Copyright (c) 2006, Broadcom Corporation.
+Copyright (c) 2015, Raspberry Pi (Trading) Ltd
+All rights reserved.
+
+Redistribution.  Redistribution and use in binary form, without
+modification, are permitted provided that the following conditions are
+met:
+
+* This software may only be used for the purposes of developing for, 
+  running or using a Raspberry Pi device.
+* Redistributions must reproduce the above copyright notice and the
+  following disclaimer in the documentation and/or other materials
+  provided with the distribution.
+* Neither the name of Broadcom Corporation nor the names of its suppliers
+  may be used to endorse or promote products derived from this software
+  without specific prior written permission.
+
+DISCLAIMER.  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGE.
+

lib/blobs/usbboot/README.md

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+usbboot
+=======
+
+The files in this directory were taken from
+https://github.com/raspberrypi/usbboot.