Also add a configuration switch to disable the codegen, so we can
still use the metadata emit and tsickle pre-processing in the
build pipeline for angular itself.
Most of the bugs discovered so far in the offline compiler were related to the StaticReflector. As it was part of angular2 core, it was hard to update. Moving it into the compiler_cli allows to release more often until the compiler_cli gets more stable.
Note: Moving the unit test next to the sources is the simplest option for now in terms of build setup.
Note: This commit only does the move. The next commit updates the build to run it again.
