[CSV-94] Lexer should only use char fields.
[CSV-94] Lexer should only use char fields.

git-svn-id: 3cfc64c80f2e6f92f6d08f3c7f3967ef35335cd9@1397863 13f79535-47bb-0310-9956-ffa450edef68

tkruse/commons-csv