Bug fix : allow \r\n as locales break lines

This bug was described in  issue #6
Implement entitieschars() helper function

Convert either array or strings to html entities
Strings library : upgrade resume functions

Also implements maxlength() methods which works on characters instead
of words
bug fix : libraries can be loaded only once
Strings library : remove nl2url

This function was deprecated and equivalent to path_encode() function
from helpers
Implement core View class and remove Tpl library

This methods should be used for templates parsing and zone includes. It
should soon contains some shortcuts.
Response class now uses View class for templates
Release v1.2.3