Update metrics to support java 9

http://openjdk.java.net/jeps/223
Java decided to change their versioning scheme and in doing so modified the
java.version system property to return $major[.$minor][.$secuity][-ea], as
opposed to 1.$major.0_$identifier we can handle pre-9 by checking if the "major"
is equal to "1", otherwise, 9+

of course, it really wouldn't be all that simple if they didn't add a quirk, now would it.
valid strings for the major may potentially include values such as -ea to deannotate a pre release

Spigot-Server-Patches/Paper-Metrics.patch

@@ -15,7 +15,7 @@ decisions on behalf of the project.
 
 diff --git a/src/main/java/com/destroystokyo/paper/Metrics.java b/src/main/java/com/destroystokyo/paper/Metrics.java
 new file mode 100644
-index 000000000..9389f9a8c
+index 000000000..e257d6b36
 --- /dev/null
 +++ b/src/main/java/com/destroystokyo/paper/Metrics.java
 @@ -0,0 +0,0 @@
@@ -37,6 +37,8 @@ index 000000000..9389f9a8c
 +import java.util.concurrent.Callable;
 +import java.util.logging.Level;
 +import java.util.logging.Logger;
++import java.util.regex.Matcher;
++import java.util.regex.Pattern;
 +import java.util.zip.GZIPOutputStream;
 +
 +/**
@@ -614,7 +616,29 @@ index 000000000..9389f9a8c
 +                    String javaVersion = System.getProperty("java.version");
 +                    Map<String, Integer> entry = new HashMap<>();
 +                    entry.put(javaVersion, 1);
-+                    map.put("Java " + javaVersion.substring(0, javaVersion.lastIndexOf('.')), entry);
++
++                    // http://openjdk.java.net/jeps/223
++                    // Java decided to change their versioning scheme and in doing so modified the java.version system
++                    // property to return $major[.$minor][.$secuity][-ea], as opposed to 1.$major.0_$identifier
++                    // we can handle pre-9 by checking if the "major" is equal to "1", otherwise, 9+
++                    String majorVersion = javaVersion.split("\\.")[0];
++                    String release;
++
++                    int indexOf = javaVersion.lastIndexOf('.');
++
++                    if (majorVersion.equals("1")) {
++                        release = "Java " + javaVersion.substring(0, indexOf);
++                    } else {
++                        // of course, it really wouldn't be all that simple if they didn't add a quirk, now would it
++                        // valid strings for the major may potentially include values such as -ea to deannotate a pre release
++                        Matcher versionMatcher = Pattern.compile("\\d+").matcher(majorVersion);
++                        if (versionMatcher.find()) {
++                            majorVersion = versionMatcher.group(0);
++                        }
++                        release = "Java " + majorVersion;
++                    }
++                    map.put(release, entry);
++
 +                    return map;
 +                }));
 +            }
@@ -647,7 +671,7 @@ index 3d8ee9ed3..5ab2cf6ee 100644
  
      static void readConfig(Class<?> clazz, Object instance) {
 diff --git a/src/main/java/org/spigotmc/SpigotConfig.java b/src/main/java/org/spigotmc/SpigotConfig.java
-index 80068e285..c779e035c 100644
+index 1b5158c0d..9ce3e1365 100644
 --- a/src/main/java/org/spigotmc/SpigotConfig.java
 +++ b/src/main/java/org/spigotmc/SpigotConfig.java
 @@ -0,0 +0,0 @@ public class SpigotConfig