Add recycle bin

[liorkesos]

Add a recyclebin type of state - so when we remove a task it goes there instead of removing.

[nevos]

does this make a task "archived", as per #524

[nevos]

After discussion with @liorkesos we decided that we will add a object called 'deleted' on the model and toggle them accordingly
model could be

deleted:{
  'date':date,
  'state':boolean
}

[nevos]

@liorkesos needed design for recycle bin under config setting

[nevos]

@arbel we need design for recycle/unrecycle buttons, as well as location from which to do these actions.
cc @liorkesos