conversation: ui refactoring

* show selected contact number
* use recycler view for better performance
* material design revamp

Tuleap: #102
Change-Id: I06fdabc97122bb40d026f5e49bd1d8a5ecb99ae7
diff --git a/ring-android/app/build.gradle b/ring-android/app/build.gradle
index dc6e374..6501a32 100644
--- a/ring-android/app/build.gradle
+++ b/ring-android/app/build.gradle
@@ -8,6 +8,7 @@
     compile 'com.android.support:design:23.1.+'
     compile 'com.android.support:cardview-v7:23.1.+'
     compile 'com.android.support:preference-v14:23.1.+'
+    compile 'com.android.support:recyclerview-v7:23.1.+'
     compile 'com.jayway.android.robotium:robotium-solo:5.4.1'
     compile 'com.astuetz:pagerslidingtabstrip:1.0.1'
     compile 'com.googlecode.libphonenumber:libphonenumber:7.0.11'