conversation: allow to select number to use

ring-android/app/src/main/AndroidManifest.xml

...pp/src/main/java/cx/ring/client/ConversationActivity.java

...oid/app/src/main/java/cx/ring/loaders/ContactsLoader.java

...roid/app/src/main/java/cx/ring/loaders/HistoryLoader.java

...-android/app/src/main/java/cx/ring/model/CallContact.java

...droid/app/src/main/java/cx/ring/service/LocalService.java

...p/src/main/res/drawable-hdpi/ic_dialer_sip_black_24dp.png

...android/app/src/main/res/drawable-hdpi/ring_logo_24dp.png

...p/src/main/res/drawable-mdpi/ic_dialer_sip_black_24dp.png

...android/app/src/main/res/drawable-mdpi/ring_logo_24dp.png

.../src/main/res/drawable-xhdpi/ic_dialer_sip_black_24dp.png

...ndroid/app/src/main/res/drawable-xhdpi/ring_logo_24dp.png

...src/main/res/drawable-xxhdpi/ic_dialer_sip_black_24dp.png

...droid/app/src/main/res/drawable-xxhdpi/ring_logo_24dp.png

...rc/main/res/drawable-xxxhdpi/ic_dialer_sip_black_24dp.png

...roid/app/src/main/res/drawable-xxxhdpi/ring_logo_24dp.png

ring-android/app/src/main/res/layout/frag_conversation.xml

ring-android/app/src/main/res/layout/item_number.xml

...-android/app/src/main/res/layout/item_number_selected.xml

ring-android/app/src/main/res/menu/conversation_actions.xml