v4 - provide all in one html for documentation and/or fix search

Created by: ttaranov

documentation navigation for V4 on http://v4-alpha.getbootstrap.com/ could use some improvement. Specifically,

• search feature is hardly usable (it doesn't pick up most things available in documentation)
• lack of all-in-one documentation html makes using browser based search nearly impossible

In other words, it's difficult to impossible to use current v4 documentation site as a development reference site (without relying on google or some other third party documentation search service).