Update .gitignore

Author: anthonygauthier

.gitignore

@@ -20,3 +20,22 @@
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
+
+# Maven
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.project
+.classpath
+.settings/*
+.settings
+
+# IntelliJ
+**.idea
+*.iml