Add Java PoC and fixes to make it work (#1887)

* Add Java PoC and fixes to make it work
* Add a top-level build file that builds both pure-java and android projects

.gitignore

@@ -34,6 +34,7 @@ captures/
 
 # Intellij
 android/.idea
+java/.idea
 *.iml
 .idea/workspace.xml
 .idea/tasks.xml

android/CouchbaseLite/src/androidTest/java/com/couchbase/lite/BaseReplicatorTest.java

@@ -29,9 +29,9 @@
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
-import static com.couchbase.lite.ReplicatorConfiguration.ReplicatorType.PULL;
-import static com.couchbase.lite.ReplicatorConfiguration.ReplicatorType.PUSH;
-import static com.couchbase.lite.ReplicatorConfiguration.ReplicatorType.PUSH_AND_PULL;
+import static com.couchbase.lite.AbstractReplicatorConfiguration.ReplicatorType.PULL;
+import static com.couchbase.lite.AbstractReplicatorConfiguration.ReplicatorType.PUSH;
+import static com.couchbase.lite.AbstractReplicatorConfiguration.ReplicatorType.PUSH_AND_PULL;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
 import static org.junit.Assert.assertNull;

android/CouchbaseLite/src/ce/java/com/couchbase/lite/DatabaseConfiguration.java

@@ -56,12 +56,9 @@ public DatabaseConfiguration setDirectory(@NonNull String directory) {
     }
 
     //---------------------------------------------
-    // Package level access
+    // protected methods
     //---------------------------------------------
 
-    DatabaseConfiguration readonlyCopy() {
-        final DatabaseConfiguration config = new DatabaseConfiguration(this);
-        config.setReadonly(true);
-        return config;
-    }
+    @Override
+    protected DatabaseConfiguration getDatabaseConfiguration() { return this; }
 }