MozStumbler v0.17.0

* Add cell data to the lookup requests in MapActivity (@tamcap)
* Check GPS only when start scan clicked [fix #494] (@illarionov)
* Add Wi-Fi scanner status [fix #302] (@illarionov)
* Add "Scan AP's even when Wi-FI is off" setting [fix #32] (@illarionov)
* Do not unnecessarily export MozStumbler services (@cpeterso)
* Update Android SDK tools to 22.6.1 and build tools to 19.0.3 (@cpeterso)
* Add Persian translation
* Update German translation (@romankl and @Djfe)
* Update Russian translation (@CupIvan)
* Update Spanish translation (@rodmoreno and @stripTM)
* Clean up strings.xml translation files (@Djfe)