First attempt (not currently working)
Changed implementation of static row-generation functions
Changed row.bells property declaration

See http://docs.cython.org/src/userguide/extension_types.html#properties
Removed Row.rounds(int n) to avoid confusion with Row.rounds()
Split out optional arguments for e.g. Row::cyclic() into separate overloaded method declarations
Added unit tests for static methods
Merge branch 'feature/static-row-methods'
Corrected test case ordering