Mystery of class '[object Object]' resolved.

UndefinedObject >> subclass:... sent the symbol object
to the ClassBuilder, unlike Class which asString-ed it.

So `nil subclass: #Object` misbehaved.
Merge pull request #327 from herby/nil-subclass-symbol-fix

Mystery of class '[object Object]' resolved.
Fixes #326. Stops subtree aliasing at block boundary.
Merge pull request #328 from herby/gh-326

Fixes #326. Stops subtree aliasing at block boundary.
Kernel-Tests: fix compilation error with new compiler

nonBoolean was an unknown variable before
UnknownVariableError: add >>messageText
Error: set default messageText to the name of the error class
ClassCategoryReader: remove unused variable 'chunkParser'
ClassCommentReader: remove unused variable 'chunkParser'
REPL.st: fix deprecation warning

use Class>>subclass:instanceVariableNames:package:
instead of Class>>subclass:instanceVariableNames:category:
REPL: recompile
ClassCommentReader: update class comment
Merge pull request #331 from mkroehnert/fixes

Compilation error/deprecations fixes + unused code removal
Merge branch 'master' into ast-interpreter

Conflicts:
	js/Kernel-Classes.deploy.js
	js/Kernel-Classes.js
	js/Kernel-Objects.deploy.js
	js/Kernel-Objects.js
	js/Kernel-Tests.deploy.js
	js/Kernel-Tests.js
	st/Compiler-AST.st
	st/Kernel-Tests.st