Ver 1.3.0 RC3: incoming transactions are seen immediately, checkpoints updated, images updated (ty joiblumen!)

	modified:   wallet/AndroidManifest.xml
	modified:   wallet/assets/checkpointsauroracoin
	modified:   wallet/pom.xml
	modified:   wallet/res/drawable-hdpi-v11/stat_notify_received.png
	modified:   wallet/res/drawable-hdpi/currency_symbol_btc.png
	modified:   wallet/res/drawable-xhdpi-v11/stat_notify_received.png
	modified:   wallet/src/de/schildbach/wallet/Constants.java
	new file:   wallet/res/drawable-hdpi-v11/currency_symbol_btc.png