Mysql query with a binary char was raising.

When mysql query contained a binary char we were getting:
 ArgumentError:invalid byte sequence in UTF-8
That is because we cannot do a regex match on the string.
In order to solve that we should use .include? string method instead of match.
Test in both mysql drivers
Merge pull request #28 from 37signals/fix_mysql_binary_char

Mysql query with a binary char was raising.