Resolve tablet/phone issue, now one APK can be used for both

Conflicts:
	src/org/irmacard/androidverifier/AnimatedArrow.java
Add Settings Activity.

The Settings Activity makes it possible to change:
 - the language of most interface texts (closes #16)
 - the verification specification (closes #17)
Merge branch 'settings'
Update status messages (English and Dutch).
Fix arrow size on Nexus S
Merge branch 'master' of github.com:credentials/irma_android_verifier
Merge branch 'master' into demo_stadspas_nl

Conflicts:
	AndroidManifest.xml
	res/drawable-hdpi/arrows_blue_animated.gif
	res/drawable-hdpi/irma_arrow.png
	res/drawable-hdpi/irma_arrow_080px.png
	res/drawable-hdpi/irma_arrow_120px.png
	res/drawable-sw600dp/irma_arrow.png
	res/drawable-xhdpi/arrows_blue_animated.gif
	res/drawable-xhdpi/irma_arrow.png
	res/values/strings.xml
	src/org/irmacard/androidverifier/stadspas/AnimatedArrow.java
	src/org/irmacard/androidverifier/stadspas/AnonCredCheckActivity.java