AmberCli: fix formatting of return statements
AmberCli: move testrunner to cli package
remove 'test' directoy after the runner has been integrated into AmberCli
recompile
Merge pull request #941 from johnnyzz/master

In Javascript the keyword 'native' is reserved
Merge pull request #942 from mkroehnert/testrunner

move Testrunner into the amber-cli script
Adds PlatformInterface >> prompt:default:
Merge branch 'master' of github.com:amber-smalltalk/amber
Fixes #945

- Adds `nil.isNil` to be able to easily compare nil objects from
different JS environments
- Fixes `ifNil:` inlining
removes unused method `ASTDebugger >> nextNode`
Recompiles all files