Ignore IDEA directory.

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636181 13f79535-47bb-0310-9956-ffa450edef68
Added some jsr305

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636369 13f79535-47bb-0310-9956-ffa450edef68
Added some testcases

git-svn-id: https://svn.apache.org/repos/asf/maven/plugins/trunk@1636370 13f79535-47bb-0310-9956-ffa450edef68