Deprecate GraphId annotation. (#426)

Mark GraphId as deprecated and advise to use the Id annotation. 

Also apply import formatter.
Fixes #417

core/src/main/java/org/neo4j/ogm/annotation/GraphId.java

@@ -13,7 +13,11 @@
 
 package org.neo4j.ogm.annotation;
 
-import java.lang.annotation.*;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Inherited;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
 
 /**
  * Identifies the field in the domain entity which is to be
@@ -22,7 +26,10 @@
  * field called id.
  *
  * @author Vince Bickers
+ * @deprecated Just replace {@link GraphId} with {@link Id} and {@link GeneratedValue}.
+ * By default the {@link org.neo4j.ogm.id.InternalIdStrategy} will be used.
  */
+@Deprecated
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.FIELD)
 @Inherited

neo4j-ogm-docs/src/main/asciidoc/reference/annotations.adoc

@@ -385,7 +385,7 @@ If the field of type `Long` is simply named 'id' then it is not necessary to ann
 == @GraphId: Neo4j id field
 
 The `@GraphId` annotation is superseded by `@Id @GeneratedValue` and exists for backwards compatibility.
-It will be eventually deprecated and removed.
+It is deprecated and will eventually be removed.
 
 [WARNING]
 ***Do not*** rely on this ID for long running applications. Neo4j will reuse deleted node ID's. It is recommended users come up with their own