Merge pull request #13 from ahellander/develop

Develop
Added the polarisome model
Merge branch 'develop' of github.com:briandrawert/pyurdme into coral_model
Fixed cylinder_demo and removed model.vol (model.dofvol is available)
Merge pull request #15 from ahellander/develop

Develop
Fixed bug, volume was added to custom propensities
Merge branch 'develop' of github.com:briandrawert/pyurdme into coral_model
fixed on bug that coral model elucidates, found another
Merge pull request #67 from briandrawert/coral_model

Fixed cylinder demo and removed model.vol