PVT RC1

• Pill bootloader now checks for the HMAC appended in the binary
• Both Pill and Sense advertise with factory info that includes device type, version, and ID
• Updated SHA1 implementation (kitsune)
• Fixed a bug with pill entering sleep mode too aggressively, causing shake to drop.
• Adjusted Shake threshold to 10Hz (from 15Hz in Pill1)
• Pill1p5's ant type adjusted to Pill1 for backward compatibility.