SHIRO-431: added .gitignore. Thanks for the pull request!

git-svn-id: https://svn.apache.org/repos/asf/shiro/trunk@1468742 13f79535-47bb-0310-9956-ffa450edef68

.gitignore

@@ -0,0 +1,42 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# IntelliJ
+*.ipr
+*.iml
+*.iws
+.idea/
+
+#
+# Eclipse metadata.
+#
+.project
+.classpath
+.settings/
+
+#
+# Eclipse and Maven output folders.
+#
+bin/
+target/
+
+#
+# Maven release metadata
+#
+release.properties
+pom.xml.*
+-