Ported the database model onto greenDAO.
Fixed the placeholder used for model generation.
Fixed and upgraded the build script.
Written the procedure path to upgrade from version not using greenDAO.
Updated code version.
Updated documentation.
Fixed #5 (Can't add items).
Introduced gestures.

It is now possible to use a fling, a long press and so on to trigger
actions on the whole list, like checking everything or discarding
checked items. A contextual actions menu can also be open on gesture.

As a consequence, the option menu is simplified. All those actions are
replaced by a unique entry which opens the contextual actions menu.
Removed useless boolean in EditFragment.
Improved gestures.

Gestures are now enabled on multi-touch. They can be applied on the
whole screen and they are finally reliable.
Updated README with installation information.
Introduced preferences for the swipe gestures.

Also improved sensitivity and fixed gestures computing.
Fixed #9 (Move or add confirmation to "Remove All Items").
Added CheckOrUncheckAll and UncheckOrCheckAll actions for gestures.
Fixed the reported number of items changed on action result.
Tweaked the menu layout to minimize clicks for the action menu if possible.
Updated french translation.
Updated documentation.
Updated spanish translation.
Added spanish documentation.