Work around unexpected IllegalArgumentException when user enters garbage host name

app/build.gradle

@@ -80,5 +80,6 @@ dependencies {
 
     // for tests
     testCompile 'junit:junit:4.12'
+    testCompile 'com.squareup.okhttp3:mockwebserver:3.2.0'
     androidTestCompile 'com.squareup.okhttp3:mockwebserver:3.2.0'
 }

app/src/main/java/at/bitfire/davdroid/ui/setup/LoginCredentialsFragment.java

@@ -24,7 +24,9 @@ import android.widget.RadioButton;
 import java.net.IDN;
 import java.net.URI;
 import java.net.URISyntaxException;
+import java.util.logging.Level;
 
+import at.bitfire.dav4android.Constants;
 import at.bitfire.davdroid.R;
 import at.bitfire.davdroid.ui.widget.EditPassword;
 
@@ -122,8 +124,11 @@ public class LoginCredentialsFragment extends Fragment implements CompoundButton
                 if (host.isEmpty()) {
                     editBaseURL.setError(getString(R.string.login_url_host_name_required));
                     valid = false;
-                } else
+                } else try {
                     host = IDN.toASCII(host);
+                } catch(IllegalArgumentException e) {
+                    Constants.log.log(Level.WARNING, "Host name not conforming to RFC 3490", e);
+                }
 
                 String path = baseUrl.getEncodedPath();
                 int port = baseUrl.getPort();

app/src/test/java/at/bitfire/davdroid/HttpClientTest.java

@@ -29,7 +29,7 @@ public class HttpClientTest extends TestCase {
         httpClient = HttpClient.create();
 
         server = new MockWebServer();
-        server.start();
+        server.start(30000);
     }
 
     @Override

build.gradle

@@ -12,7 +12,7 @@ buildscript {
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.0.0+'
+        classpath 'com.android.tools.build:gradle:2.1.0'
     }
 }
 

doc/.gitignore

@@ -0,0 +1 @@
+pr/