New "use" statement in template views

You can delcare some "assets_packages" in the "extra" block of your
"compser.json" to predegine a table of assets plugins that can be
"used" in the views - the "_use()" method will then load all required
assets automatically. See the examples of "jquery.tablesorter" and
"jquery.highlight" in the package manifest.
The layout and demo pages now use this feature.

Some new Smartphone icons are setted and included in the pages header
(if present in "www/icons/").

CSS styles are cleaned to be just what necessary.

Upgrade to version 0.0.5
Use all Helpers and Tools in the view aliases

Notice: with this modification, any Helper or Tool class must be called
as "Helper\ClassName" or "Tool\Classname" in global methods.
WIP - test of new "extra" features

.. to be tested
New presets and assets managers

Each assets sub-package is now handled by a "Cluster" class to organize
it based on its "extra" definition and retrieve its assets files in the
global context.

Each preset is handled by a "Preset" class which will search preset
files and load them in the Template Engine objects when necesasry
(using the "_use()" alias method).

Upgrade to version 0.0.6
Oups - a little typo in the code :(
New common gitignore of Les Ateliers
Merging "master"

And common gitignore for "dev" branch