Java 5 update of the code

pom.xml

...e/maven/plugin/announcement/AbstractAnnouncementMojo.java

...pache/maven/plugin/announcement/AnnouncementMailMojo.java

...rg/apache/maven/plugin/announcement/AnnouncementMojo.java

...java/org/apache/maven/plugin/announcement/MailSender.java

.../org/apache/maven/plugin/changes/AbstractChangesMojo.java

...rg/apache/maven/plugin/changes/AbstractChangesReport.java

...ava/org/apache/maven/plugin/changes/ChangesCheckMojo.java

...ain/java/org/apache/maven/plugin/changes/ChangesMojo.java

...g/apache/maven/plugin/changes/ChangesReportGenerator.java

...org/apache/maven/plugin/changes/ChangesValidatorMojo.java

...main/java/org/apache/maven/plugin/changes/ChangesXML.java

...ache/maven/plugin/changes/ChangesXMLRuntimeException.java

...n/java/org/apache/maven/plugin/changes/FeedGenerator.java

...in/java/org/apache/maven/plugin/changes/IssueAdapter.java

...in/java/org/apache/maven/plugin/changes/ProjectUtils.java

...in/java/org/apache/maven/plugin/changes/ReleaseUtils.java

.../plugin/changes/schema/DefaultChangesSchemaValidator.java

...maven/plugin/changes/schema/SchemaValidatorException.java

...java/org/apache/maven/plugin/github/GitHubDownloader.java