add example code to build and convert models
Merge pull request #58 from joergkappes/RC2.1

add example code to build and convert models
add licence and changelog
Merge pull request #59 from joergkappes/RC2.1

add licence and changelog
Merge branch 'RC2.1' of git://github.com/opengm/opengm into RC2.1
Python Changes:
 - changed value type in python from float to double
 - added AlphaExpasionFusion to Python
Merge branch 'RC2.1' of github.com:DerThorsten/opengm into RC2.1