ISPN-4177 Upgrade to WildFly 8.1.0.Final

https://issues.jboss.org/browse/ISPN-4177

Big Effing Commit
- Upgrade our server base to WildFly 8.1.0.RC2
- Rebase our REST service on Undertow
- New build strategy that uses the wildfly-dist package as a base instead of keeping a copy of all the upstream build machinery
- Rename server/integration/integration to server/integration/endpoint: the cacophony was driving me spare