Added latest mutators to installation SQL scripts

Added the latest mutators (OLE2, MachO and Melkor ELF wrappers) to the SQL installation scripts.
Fixed bug getting disassembly at $PC with VTrace

Sometimes the VTrace interface wasn't returning the disassembly at $PC because the disassembler stopped disassembling at some (likely invalid) instruction when trying to get the instructions before the $PC. In this case, we put always the disassembly at $PC.
Fix issue #12

Finally, discovered how to fix this.
Merge branch 'master' of https://github.com/joxeankoret/nightmare