Properly format cell data before submitting to the server.

As it turns out it is not necessary to group cells by radio
type, and instead, the radio type should come from the TelephonyManager
Android API.
Add two SSIDs to block list

CommuteNet, from Copenhagen S-Tog train, closes mozilla/mozstumbler#578
stagecoach-wifi, from Stagecoach buses in the United Kingdom, seen in
Lancaster
Disable hardware acceleration to reduce memory usage
This significantly reduces initial memory usage. From 29MB to 5MB on Nexus 5
Added SSIDs for Swiss PostAuto and German coach companies
Add FlixBus to SSID-blocklist (solves #586)
simplify travis build
Added an Israeli bus service 

Nazareen express - Afifi (also the CEO's name...)
MozStumbler v0.20.0
URGENT bugfix

We never cleaned up the mCellData and mWifiData  after reading from them - making them become HUGE and exponentially increasing storage necessary by MozStumbler by having thousands if not millions of duplicates.
MozStumbler v0.20.2
MozStumbler v0.20.3
Update french stings (refresh_map)