Merge pull request #1 from anparks/master

Fixed util import in simple_inventory.py
add Impinj R1000 hybrid mode ROSpec example XML
Merge branch 'master' of github.com:ransford/sllurp
path fix
bring default ROSpec in line with docs/impinj-r1000-hybrid-mode-rospec.xml
AntennaID -> AntennaIDs
more debugging for TagReportContentSelector
properly shut down reactor on connection fail/lost
after disconnect, report number of tags seen via callback