Update .gitignore

.gitignore

@@ -1,12 +1,23 @@
-*.class
+# Eclipse files.
 
-# Mobile Tools for Java (J2ME)
-.mtj.tmp/
+.classpath
+.project
+.settings
 
-# Package Files #
-*.jar
-*.war
-*.ear
+# Maven target.
 
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.next
+release.properties
+
+# Gradle.
+
+bin
+.gradle
+build
+
+# Others.
+
+*~