added URL and moved junit dependency up to the plugin root POM
added URL and moved junit dependency up to the plugin root POM

kuldazbraslav/jira-plugin,warden/jira-plugin,kuldazbraslav/jira-plugin,warden/jira-plugin,deki/jira-plugin,escoem/jira-plugin,escoem/jira-plugin,deki/jira-plugin