Compress variable naming scheme:

* Internally (and externally): BELT => B
* Remove `core` namespace and other less useful things
Rename namespace() => createNamespace()
Add noConflict() fn
Fix isEqual() bug
Update return statements/struc on forItem/forOwn
Improve clone()
Add fundamentals for refactored extend()
Add draft of non-stringy isArguments() fn
Test isArguments() fn-- works in IE8+, and 3x-10x perf improvement.
Draft extend() that's useful