Solving regexp_m17n using bytewise conversion

See the commit messages AND source comments on my changes. This is robust and fulfils the requirement to still use Regexp.
![screen shot 2014-08-08 at 09 31 13](https://cloud.githubusercontent.com/assets/3684890/3853880/122b5bc6-1ece-11e4-9422-f78176d605c1.png)