Add PageTitle class to canonicalize page names

app/src/androidTest/java/fr/free/nrw/commons/MediaTest.java

@@ -0,0 +1,23 @@
+package fr.free.nrw.commons;
+
+import android.support.test.runner.AndroidJUnit4;
+
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.hamcrest.CoreMatchers.is;
+
+// TODO: use Robolectric and make it runnable without a connected device
+@RunWith(AndroidJUnit4.class)
+public class MediaTest {
+    @Test public void displayTitleShouldStripExtension() {
+        Media m = new Media("File:Example.jpg");
+        Assert.assertThat(m.getDisplayTitle(), is("Example"));
+    }
+
+    @Test public void displayTitleShouldUseSpaceForUnderscore() {
+        Media m = new Media("File:Example 1_2.jpg");
+        Assert.assertThat(m.getDisplayTitle(), is("Example 1 2"));
+    }
+}