Removed intl submodules. lookupBestLang moved to a yui submodule (still sits on Y.Intl.lookupBestLang), so there was no need for intl-load

Broke Intl into intl-load submodule (so loader can start with a lighter footprint) and intl-lang submodule (for regular lang bundle caching support). Added manual test file (need to convert to unit test). General code/api doc dusting off.

Initial Intl mgr drop. Not functional. Needs loader stubs filled out