Merge pull request #219 from eregon/boostvm_refs

Remove permanent BoostVM references
Maybe fixed a bug which caused SEGFAULT when using gcDo on a -g *.ozf.
Avoid generating `getSelf`/`setSelf` instructions for class with locking.
Merge pull request #217 from kennytm/debug-sym-fix

Fix some bugs regarding debugging symbols (ozc -g)
Upgrade the Scala ecosystem of the bootcompiler.

- sbt 0.13.6
- Scala 2.11.2
- scopt 3.2.0

Fixes #221, because Scala 2.11 should be able to read JDK8 stuff.
Merge pull request #222 from sjrd/upgrade-scala-stuff

Upgrade the Scala ecosystem of the bootcompiler.
Update ASIO wrapper constructors to only take BoostEnvironment and VMIdentifier

* Restore the behavior of creating a new TCPConnection
  in every call of startAsyncAccept().