Cleanup poms, update copyright header

pom.xml

@@ -17,7 +17,7 @@
     </modules>
 
     <name>LuckPerms</name>
-    <description>An advanced permissions implementation for Bukkit/Spigot, BungeeCord and Sponge.</description>
+    <description>An advanced permissions plugin for Bukkit/Spigot, BungeeCord and Sponge.</description>
     <url>https://github.com/lucko/LuckPerms</url>
 
     <licenses>
@@ -37,12 +37,20 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+
+        <!-- Disable tests -->
         <skipTests>true</skipTests>
         <maven.test.skip>true</maven.test.skip>
 
+        <!-- Manually entered release version -->
         <release.version>3.1</release.version>
+
+        <!-- Get how many commits have been made since the last tag (the previous release) -->
         <patch.version>${git.closest.tag.commit.count}</patch.version>
 
+        <full.version>${release.version}.${patch.version}</full.version>
+
+        <!-- Standard versions used by the whole project -->
         <compiler.version>3.6.1</compiler.version>
         <shade.version>3.0.0</shade.version>
         <lombok.version>1.16.16</lombok.version>
@@ -60,10 +68,15 @@
     </distributionManagement>
 
     <ciManagement>
-        <system>jenkins</system>
+        <system>Jenkins</system>
         <url>https://ci.lucko.me/job/LuckPerms</url>
     </ciManagement>
 
+    <issueManagement>
+        <system>GitHub</system>
+        <url>https://github.com/lucko/LuckPerms/issues</url>
+    </issueManagement>
+
     <build>
         <plugins>
             <plugin>
@@ -92,10 +105,6 @@
             <id>luck-repo</id>
             <url>https://repo.lucko.me/</url>
         </repository>
-        <repository>
-            <id>oss-sonatype-snapshots</id>
-            <url>https://oss.sonatype.org/content/repositories/snapshots/</url>
-        </repository>
         <repository>
             <id>spigot-repo</id>
             <url>https://hub.spigotmc.org/nexus/content/repositories/snapshots/</url>
@@ -104,21 +113,6 @@
             <id>sponge-repo</id>
             <url>https://repo.spongepowered.org/maven</url>
         </repository>
-        <repository>
-            <id>vault-repo</id>
-            <url>http://nexus.hc.to/content/repositories/pub_releases</url>
-        </repository>
-        <repository>
-            <id>lilypad-repo</id>
-            <url>http://ci.lilypadmc.org/plugin/repository/everything</url>
-        </repository>
-        <repository>
-            <id>pex-repo</id>
-            <url>http://pex-repo.aoeu.xyz</url>
-        </repository>
-        <repository>
-            <id>bungeeperms-repo</id>
-            <url>http://repo.wea-ondara.net/repository/public/</url>
-        </repository>
     </repositories>
+
 </project>