Buffered Ports 

Re-issue of pull request https://github.com/planthaber/rock-webapp/pull/11 against master
resulted in an execution error "no block given". Map requires a block, not a parameter.
could make it
```ruby
Hash[tasks: Orocos.name_service.each_task.map { |task| task.to_h }]
```
or 
```ruby
Hash[tasks: Orocos.name_service.each_task.map do 
  |task| task.to_h
  end
]
```
though but don't see why this is better in terms of readability