Peter Serwylo 92943ebdf3 Port intent which handles incoming fdroid repos from NFC.
Moved intent-filter from FDroid to MainActivity. Can test from the
command line with:

```
adb shell am start -a android.nfc.action.NDEF_DISCOVERED \
 -d fdroidrepo://10.0.1.10:8888/fdroid/repo
```
2017-03-08 10:33:32 +11:00
..