Bump java language to 11 (#980)

* Moved java XML and annotations dependencies to project level instead
of as profiles
* Set compiler language level to 11
* Removed jdk8 from travis build

* Kept java level 8 in naked-objects/dom for datanucleus enhancer, for
now.

naked-objects/dom/pom.xml

@@ -36,6 +36,17 @@
 				</excludes>
 			</resource>
 		</resources>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>${compiler.version}</version>
+				<configuration>
+					<source>8</source>
+					<target>8</target>
+				</configuration>
+			</plugin>
+		</plugins>
 	</build>
 
 	<dependencies>

naked-objects/integtests/pom.xml

@@ -90,6 +90,11 @@
 			<artifactId>hsqldb</artifactId>
 		</dependency>
 
+		<dependency>
+			<groupId>javax.annotation</groupId>
+			<artifactId>javax.annotation-api</artifactId>
+		</dependency>
+
         <!-- 
         uncomment to enable enhanced cucumber-jvm reporting
         http://www.masterthought.net/section/cucumber-reporting
@@ -122,20 +127,5 @@
         </repository>  
     </repositories>  
      -->
-	<profiles>
-		<profile>
-			<id>jdk11-deps</id>
-			<activation>
-				<jdk>[11,)</jdk>
-			</activation>
-			<dependencies>
-				<dependency>
-					<groupId>javax.annotation</groupId>
-					<artifactId>javax.annotation-api</artifactId>
-				</dependency>
-			</dependencies>
-		</profile>
-	</profiles>
-
 
 </project>