2.10 WIP: tests passing for 2.10 to 2.9.0-1, but tests hanging for 2.9.0

- specs2 is org.specs2 packaged now
- fixed ambiguous call to XmlElem.
- need to use SBT 0.12.x
Dropped 2.9.0 and 2.9.0-1

2.9.0-1 was actually OK; 2.9.0 tests was hanging unless you force the JVM to say it's SUN rather than ORACLE, but then was generating a StackOverflowErrror.