Partially complete Sphinx documentation

Sphinx documentation with empty place holder for tutorial. Migration of
README for guide. And API documentation for begin.start decorator.
Merge changes from master to docs
Additional example applications

New exaple applications demonstrating the use of begins.
Update flask quickstart to use auto_convert

Drop the direct use of the begin.convert() decorator in favour of the
auto_convert keyword to begin.start().
Always show table of contents in sidebar

Ensure that the sidebar with show the table of contents even if it is
hidden from the main page.
Major update to begins documentation

Expand the Begins tutorial and API sections with appropriate hooks to
the user guide.
Merge branch 'docs'

Pull in the documentation branch with Sphinx docs for the begins
project.