Added a toggle to the header

Added show, hide and toggle methods to various sub components. Added a
toggle button to the header and have it highlighting correctly.
Got header behaviour working

The header now swaps between the right icons and displays a title if one
is present.
Got content toggling

The header now has a toggle event which when fired will trigger the
editor content to be shown or hidden.
Tied inline content into toggling

The editor will now display its content as HTML when inline is true and
toggling it will take the user to the editor proper where they can
modify and preview the content.
Fixed footer issue with inline editor

When using the a combination of the save and inline options the footer
was not being displayed when toggling between the inline content and the
editor.
Updated readme

Added documentation for the inline and title options. Set the default
value for the title.