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test commit, added  ____test___
added new header and footer
delete files index.md and bootstrap.2.2.2.min.css
Added top navigation (4 items). The page API documentation: added left menu(1 level items), added the submenu of the item 'Overview'.
delete some default filed (2011-12-29-jekyll-introduction.md,  archive.html, categories.html, pages.html, tags.html)
delete test sentences form overview.html
chenged top menu, left menu of item API docum. These menus were make to use markdouwn.
modified:   widgets and apps.html
added widgets_and_apps.md, deleted widgets and apps.html
added the function choose API version
correct default value select
fixed Sveta's issues(styleguide.pdf)
fixed color of the link 'get started'
added vertical line of th eleft column
fixed position of items of menu
Merge branch 'styles_api_doc'
fixed bugs of the layout
modified _layouts/api-documentation-api-v1.html, _layouts/api-documentation-overview-api-v1.html