Update .gitignore

.gitignore

@@ -1,23 +1,20 @@
-# Compiled class file
-*.class
-
-# Log file
+# Maven build files
+target
 *.log
+maven-eclipse.xml
+build.properties
+site-content
+*~
 
-# BlueJ files
-*.ctxt
+# IntelliJ IDEA files
+.idea
+.iws
+*.iml
+*.ipr
 
-# Mobile Tools for Java (J2ME)
-.mtj.tmp/
-
-# Package Files #
-*.jar
-*.war
-*.nar
-*.ear
-*.zip
-*.tar.gz
-*.rar
-
-# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
-hs_err_pid*
+# Eclipse files
+.settings
+.classpath
+.project
+.externalToolBuilders
+.checkstyle