?improving text directives

[lega911]

  {{#get user.company_id -> obj.category.id -> obj.name}}
  {{user.company_id | get category.id | get name}}
  {{user.company_id | get 'category.id -> name' }}
  {{^ some text}}
  {{#foo a, b}}
  {{::var}}
  {{=var}}

  {{translate('bla bla')}}
  {{'bla bla' | translate}}
  {{#translate bla bla}}

scope.translate = function(callback, expression, scope, env) {
};
text['^'] = function(callback, expression) {
}