Update Java ExecutionEnvironment to JavaSE-1.6

Change-Id: Ida1ad8b8b7d2b1f219e1c5321cadc8189bff9a63
Signed-off-by: Carsten Hiesserich <carsten.hie@gmail.com>
diff --git a/org.eclipse.vex.xhtml/.classpath b/org.eclipse.vex.xhtml/.classpath
index 798048d..0b1bcf9 100644
--- a/org.eclipse.vex.xhtml/.classpath
+++ b/org.eclipse.vex.xhtml/.classpath
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <classpath>
-	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/J2SE-1.5"/>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-1.6"/>
 	<classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/>
 	<classpathentry kind="src" path="src/"/>
 	<classpathentry kind="output" path="target/classes"/>