Remove Object.compare() function
Remove mixing & merging methods
Add keyword method 'option'
Remove object methods count() and is_empty()
Replace class/class_name() with keyword methods
Tweak Object.class_name_of()
Fix parameters of object method is_reg_exp()
Bundle keywords methods into a mixin
Make type checking methods static
Move keyword method 'option' to Keywords mixin
Turn keys/values() methods into keyword methods
Tweak freezing & sealing

* Remove object methods freeze/seal()
* Turn is_frozen/sealed() into static methods
Turn responds_to() into static method, remove invoke()
Turn own/has_own() into keyword methods
Prefix keywords methods with '@' in descriptions
Update handling of options using option()
Speed up running of tests on node
Remove uneeded colors from Cakefile
Clean up whitespace
Add method description_of()