Merge branch 'fp2-1793' into 'master'

 FPII-1793: Fairphone Updater app should check minimum battery level and Wi-Fi connectivity

Check battery level and Wi-Fi connectivity where required.

See merge request !12
diff --git a/res/drawable-xxhdpi/ic_battery_std_fpblue_24dp.png b/res/drawable-xxhdpi/ic_battery_std_fpblue_24dp.png
new file mode 100644
index 0000000..2ab6302
--- /dev/null
+++ b/res/drawable-xxhdpi/ic_battery_std_fpblue_24dp.png
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diff --git a/res/drawable-xxhdpi/ic_signal_wifi_4_bar_fpblue_24dp.png b/res/drawable-xxhdpi/ic_signal_wifi_4_bar_fpblue_24dp.png
new file mode 100644
index 0000000..6ae0ef1
--- /dev/null
+++ b/res/drawable-xxhdpi/ic_signal_wifi_4_bar_fpblue_24dp.png
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