extras/bacon_cape/demo_flot: work when on remote host

This example was previously hard-coded to work off of USB. It now works when hosted at other locations, including http://beaglebone.local:3000 under Cloud9 IDE
extras/bacon_cape: removed USB device IP and made paths relative

Removed references to 192.168.7.2 and replaced with window.location.hostname and relative paths
demo/blink.py: created a simple Adafruit_BBIO Python demo
demo_flot.html: enable specification of different address

http://beagleboard.github.io/bone101/extras/bacon_cape/demo_flot.html?address=beaglebone.local
should work after this as long as a BeagleBone is on your LAN
Merge branch 'gh-pages' of github.com:beagleboard/bone101 into gh-pages