Orangutan

This was a part of #1081 but I figured out that current configuration file format is too limited.

With current format such could be done with:

contexts.request_weight  = Issue:10
contexts.response_weight = Issue:10
contexts.filter_weight   = Issue:10

This is odd!..

There should be an easier way to change weight like:

Context Issue {
  Weight 10
}
Context Task {
  Weight {
    Response 10
  }
}

Changing weight maybe needed to change the priority of contexts. This way Orangutan will became more flexible.