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* added a 'view diff' button when viewing a previous version of a file
* added a 'view source' button when viewing a previous version of a file
* added an history view of previous versions of a file
* added __todo__ meta page which scan all the directory for todo directives
and display it in one page
* added more generic __xxxxxxxx__ meta page which scan all the directory
for the xxxxxxxx admnonition. This may work with any registered node,
especially admonitions:
* __todo__
* __done__
* __attention__
* __caution__
* __danger__
* __error__
* __hint__
* __important__
* __note__
* __tip__
* __warning__
* __admonition__
* added possibility to use the "admonition" meta pages for one page only
using this kind of url: /name of the doc.__admonition_name__
* added __cheatsheet__ meta page which provides locally a docutils reST
cheatsheet
* added 'done' directive, in order to work with todo: when a task is done,
edit the page and change 'todo' to 'done' (it will remove it from
__todo__ meta page)
* removed iframe
* improved docutils css
* some other refactors