Using Processing Framework in QGIS

I am writing a plugin for QGIS 2.0, and I want to use the processing framework to call some functions.

When I open the Python Console inside QGIS, I am able to call it like this:

>>> import processing

And then, for instance:

>>> processing.alglist()

However, if I try to import it in my Python Plugin, it fails to find the processing include:

from qgis.core import *
from qgis.gui import *
import processing

I googled the problem and found these directives:

from processing.core.Processing import Processing
from processing.core.ProcessingConfig import Setting, ProcessingConfig

Unfortunately, it also does not work for me.

Does anybody know how to include the QGIS processing framework in a plugin, and how to call the algorithm (let us say for instance processing.runalg(...)?

I found many explanations on how to do it in the Python Console, but not outside QGIS.