Update demos (description below). * Upgrade several demos to EmbeddedWildFlyLauncher (SDM was broken in some demos with the JBossLauncher). * Fix bugs in jpa demos relating to new IoC. * Remove non-Wildfly app server profiles for several demos (don't have resources to maintain them). * Rename jboss7 profiles to wildfly. * Update README.md files to refer to Wildfly instead of JBoss AS 6/7. * Add .gitignore.