Implementation of Strasser et al. (2010), magnitude scaling for subduction.
pep8 changes
Fixing error when building the documentation
Merge pull request #261 from luisera/mag_scal

Magnitude scaling for subduction, Strasser et al. (2010)
Now ParametricProbabilisticRupture is unpickled correctly
Merge pull request #263 from gem/pickling-ParametricProbabilisticRupture

Now ParametricProbabilisticRupture is unpickled correctly
Fixed the version in the documentation
Merge branch 'fix-version' into release-1.2