code: function getVar(token, env)
  {
    var modifiers = token.split(/\s+/)
      , name      = modifiers.pop()
      , result    = ''
      ;
  
    if (typeof env[name] == 'string' && env[name].length > 0)
    {
      result = env[name];
  
      // process value with modifiers, right to left
      result = modifiers.reverse().reduce(function(accumulatedValue, modifierName)
      {
        if (typeOf(this.modifiers[modifierName]) != 'function') {
          throw new Error('Unable to find requested modifier `' + modifierName + '` among available modifiers: [' + Object.keys(this.modifiers).join('], [') + '].');
        }
        return this.modifiers[modifierName](accumulatedValue);
      }.bind(this), result);
    }
  
    return result;
  }
docs: Gets environment variable by provided name,
  or return empty string if it doesn't exists
  
  @param   {string} token - variable token (name + modifiers) to process
  @param   {object} env - object to search within
  @returns {string} - either variable if it exists or empty string