added OpenBeacon firmware for Physical Web support
added OpenBeacon reference to platform list
Re-ordered to reduce confusion
Update README.md
Got rid of 'service leaked intent error'
Removed some unnecessary initializations
Merge pull request #85 from g-ortuno/small-improvements

Small improvements
Merge pull request #83 from meriac/master

added OpenBeacon firmware for Physical Web support
Merge branch 'master' of https://github.com/google/physical-web into show_beacon_in_list_after_rx_metadata