Required to set default object action values.
Adding action properties required for TwitterTheme:

* icon (holds icon class name [reference](http://twitter.github.com/bootstrap/base-css.html#icons))
* class (holds button class name [reference](http://twitter.github.com/bootstrap/base-css.html#buttons))

Adding getters and setters for new properties.
Adding classes for object actions (Edit, Delete).

Inside these classes default icon, label and confirm message (if necessary) are defined.
+ add/edit generator action classes
+ edit pagerfanta view (remove class `paginator` from `<ul>`)
+ add new widget templates for `date_range` and `date`
+ adding twitter bootstrap assets (css/js)
+ adding symfony2admingenerator favicon and touch icons
+ adding bootstrap-datepicker
+ editing `list` and `edit` templates
+ adding `base_admin` and `base_login` templates
Changeing default configuration
+ adding default options for date_range
+ extending default date form
+ fixing assets bundle namespaces for assetic
Top margin fix.
Switching from real to key translations. Added new translations.

Translators: please review your language translations, some translations were missing and I had to use Google Translator to fill them.
Setting default labels for actions.
Changeing translation domain to Admingenerator. Switching real translations to key translations.
Adding default key labels for DateRange form type.
Adding translations for date_range keys.
Enable label translation.
Typo fix
Translating profile logout and welcome messages.
Adding class for list Action. Defining default icon, label and class.
Adding assetic less base templates. Fixing base templates.
Shortened trans tag, typo fix