Improve documentation of MemoryAccessor interface
Update README.md
Update README.md
Fix typo in memory.go
Add NMI handling and public DoOpcode() method.
Merge pull request #2 from lkesteloot/master

Handle NMI, factor out DoOpcode() function.
Fix typo
Merge branch 'master' of github.com:remogatto/z80
Update README
Remove private doOpcodes method
Update README.md
Update README.md
Update README.md