Update .gitignore

update .gitignore for netbeans
diff --git a/.gitignore b/.gitignore
index 32858aa..3ee6ef1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,15 @@
+# Class Files #
 *.class
 
+# NetBeans specific #
+nbproject/private/
+build/
+nbbuild/
+dist/
+nbdist/
+nbactions.xml
+nb-configuration.xml
+
 # Mobile Tools for Java (J2ME)
 .mtj.tmp/