Initial support for JDK 8 builds.

Added ALPN version and moved jetty-osgi module to a profile, only
built when using JDK 7.

pom.xml

@@ -434,7 +434,6 @@
     <module>jetty-client</module>
     <module>jetty-proxy</module>
     <module>jetty-jaspi</module>
-    <module>jetty-osgi</module>
     <module>jetty-rewrite</module>
     <module>jetty-nosql</module>
     <module>jetty-quickstart</module>
@@ -814,6 +813,15 @@
         </plugins>
       </build>
     </profile>
+    <profile>
+        <id>osgi</id>
+        <activation>
+            <jdk>[1.7,1.8)</jdk>
+        </activation>
+        <modules>
+            <module>jetty-osgi</module>
+        </modules>
+    </profile>
     <profile>
       <id>7u9</id>
       <activation>
@@ -944,6 +952,19 @@
       </activation>
       <properties>
         <npn.version>1.1.6.v20130911</npn.version>
+        <alpn.version>7.0.0</alpn.version>
+      </properties>
+    </profile>
+    <profile>
+      <id>8u00</id>
+      <activation>
+        <property>
+          <name>java.version</name>
+          <value>1.8.0</value>
+        </property>
+      </activation>
+      <properties>
+        <alpn.version>8.0.0</alpn.version>
       </properties>
     </profile>
   </profiles>