Add vaadin-all as parent for bom

Needed for distributionManagement settings.

Change-Id: Ifdcbbac82ca73c86e9056b00a01b8b5e642b8e0c

bom/pom.xml

@@ -1,7 +1,11 @@
 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
-    <groupId>com.vaadin</groupId>
+    <parent>
+        <groupId>com.vaadin</groupId>
+        <artifactId>vaadin-parent</artifactId>
+        <version>1.0.0</version>
+    </parent>
     <artifactId>vaadin-bom</artifactId>
     <packaging>pom</packaging>
     <version>8.0-SNAPSHOT</version>