Partially revert 9534de3.

Was throwing nasty “Fatal error: Uncaught exception 'RuntimeException'
with message 'Accessed request service outside of request scope. Try
moving that call to a before handler or controller.' in
<bolt_install_dir>/vendor/silex/silex/src/Silex/Application.php on line
141” errors.
Bumping version numver to "1.6.0 beta 2"