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.
Disable hardware acceleration to reduce memory usage
This significantly reduces initial memory usage. From 29MB to 5MB on Nexus 5
Merge pull request #585 from illarionov/disableHardwareAcceleration

Disable hardware acceleration to reduce memory usage
Added SSIDs for Swiss PostAuto and German coach companies
Add FlixBus to SSID-blocklist (solves #586)
simplify travis build
Merge pull request #588 from illarionov/newTravis

Simplify Travis build (@illarionov)
Merge pull request #587 from JensErat/postauto-postbus

Added SSIDs for Swiss PostAuto and German coach companies (@JensErat)
Added an Israeli bus service 

Nazareen express - Afifi (also the CEO's name...)
Merge pull request #589 from yarons/patch-2

Added an Israeli bus service
Merge pull request #576 from guilherme-pg/cell-formatting

Simplify formatting of cell data (@guilherme-pg)
MozStumbler v0.20.0
Merge pull request #590 from cpeterso/v0.20.0

MozStumbler v0.20.0 (@cpeterso)