Modifications to NuSMV code generator.
- Adding some test cases.
- Modifications of code generated for naked transitions within state machine.  
- Modifications of 'Or'-operator to 'And'-operator for combining transitions.

git-svn-id: http://umple.googlecode.com/svn/trunk@4858 6ebf9d09-8eb1-0036-9d08-68c07d1b990a