Updated it for use with brew

yosemite-bluetooth-fix.sh

#!/bin/bash
# Install sleepwatcher
sudo cp /usr/local/Cellar/sleepwatcher/2.2/de.bernhard-baehr.sleepwatcher-20compatibility.plist /Library/LaunchAgents/
sudo cp /usr/local/Cellar/sleepwatcher/2.2/etc/sleepwatcher/rc.* /etc/c

# Add bluetooth script to /etc/rc.wakeup (the script requires root)
sudo tee -a /etc/rc.wakeup <<EOF
kextunload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport && sleep 3 && kextload -b com.apple.iokit.BroadcomBluetoothHostControllerUSBTransport
EOF

# Load the agent to start sleepwatcher
sudo launchctl load /Library/LaunchAgents/de.bernhard-baehr.sleepwatcher-20compatibility.plist