JBIDE-15860 : add repository warning for missing essential dependencies in quickstarts

- bumped maven plugins version to 1.5.4-SNAPSHOT
- refactored NewProjectExamplesStacksRequirementsPage to inherit MissingRepositoryWarningComponent from MavenExamplesRequirementsPage 
- testing requires addding <essentialEnterpriseDependencies>org.jboss.bom:jboss-javaee-6.0-with-hibernate:pom:1.0.4.Final-redhat-9</essentialEnterpriseDependencies> (for instance) to a quickstart definition in a project example xml descriptor