add openScale icon to the action bar.

android_app/app/src/main/java/com/health/openscale/gui/MainActivity.java

@@ -70,6 +70,10 @@ public class MainActivity extends ActionBarActivity implements
 		final ActionBar actionBar = getSupportActionBar();
 		actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
 
+        actionBar.setLogo(R.drawable.ic_launcher);
+        actionBar.setDisplayUseLogoEnabled(true);
+        actionBar.setDisplayShowHomeEnabled(true);
+
 		// Create the adapter that will return a fragment for each of the three
 		// primary sections of the activity.
 		mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());