use 1.8 in ant build files

Author: codeanticode

build.xml

@@ -36,8 +36,8 @@
 <!--
 	   classpath="../core/library/core.jar; lib/ant.jar; lib/ant-launcher.jar; lib/antlr.jar; lib/apple.jar; lib/jdt-core.jar; lib/jna.jar; lib/org-netbeans-swing-outline.jar;lib/com.ibm.icu_4.4.2.v20110823.jar;lib/jdi.jar;lib/jdimodel.jar;lib/org.eclipse.osgi_3.8.1.v20120830-144521.jar"
 -->
-    <javac source="1.7" 
-	   target="1.7" 
+    <javac source="1.8" 
+	   target="1.8" 
 	   destdir="bin" 
 	   encoding="UTF-8" 
 	   includeAntRuntime="false"

core/build.xml

@@ -29,8 +29,8 @@
     <methods dir="${basedir}/src/processing/core" recorder="false" />
 
     <mkdir dir="bin" />
-    <javac source="1.7" 
-	   target="1.7" 
+    <javac source="1.8" 
+	   target="1.8" 
 	   encoding="UTF-8"
 	   includeAntRuntime="false"
 	   bootclasspath="${env.ANDROID_SDK}/platforms/android-17/android.jar;library/android-support-v4.jar"