Optimus

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Fix dependancies syntax in setup.py that was causing issues during installation.

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* Remove CherryPy dependancy from setup.py, add an install note about this;
* Update documentation;

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Updating doc, in setup.py use 'entry_points' instead of 'scripts'

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* Fixing update method in po command to update the POT file;
* Add I18N_EXTRACT_SOURCES setting and use it in extraction method, bumping version;
* Add new behavior for settings.LANGUAGES to permit tuples instead of simple locale name;

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* Setting name ``EXTRA_BUNDLES`` is deprecated and **will be removed in a futur release**. In project settings rename it to ``BUNDLES``;
* Remove ``optimus.builder.assets.COMMON_BUNDLES``, this was containing default bundles that was not really useful. If your project used them, you will have errors on page building about missing bundles, you can recover them in your ``settings.BUNDLES`` from : ::

COMMON_BUNDLES = {
'css_screen_common': Bundle(
'css/screen.css',
filters='yui_css',
output='css/screen.min.css'
),
'css_ie_common': Bundle(
'css/ie.css',
filters='yui_css',
output='css/ie.min.css'
),
'js_ie_common': Bundle(
'js/modernizr.custom.js',
'js/respond.src.js',
filters='yui_js',
output='js/ie.min.js'
),
'js_jquery': Bundle(
'js/jquery/jquery-1.7.1.js',
filters='yui_js',
output='js/jquery.min.js'
),
}