ukanth/afwall#215: ip6tables: Use exit code 4 to indicate concurrency problems
ukanth/afwall#215: res: Update iptables binaries
RulesActivity: Show device make/model/build

This allows us to track whether certain brands or ROMs have the same
bugs.
ConnectivityChangeReceiver: Handle AP change as a connectivity change

We might not get a CONNECTIVITY_CHANGE event when the AP status changes,
so recheck the interface configuration on WIFI_AP_STATE_CHANGED events
too.
InterfaceTracker: Report isWifiApEnabled status every time it is read
travis: Don't email me on every successful build
Merge pull request #216 from cernekee/tether-debug-v2

Deug build for tether + ip6tables issue + more information while sending email