add int state suport

[otbzi]

#24

to fix this issue

[mriehl]

Hi,

Thanks for the pull request. Don't mind the python 3.2 travis... I'm going to remove it soon, since there is so much stuff that just doesn't work on 3.2.
Would you mind adding a simple test case? This would also clarify what the use case is for having an integer as state.