Helpers : remove is_cli() function

Use Request::cli() instead
Helpers : is_function becomes is_closure

is_function is now deprecated and will be removed as of the next
release.
Update .htaccess to be ready to start

This means that the .htaccess.default is no more required
Deprecated is_function, replaced by is_closure
View::parse now parse html entities by default

The third parameter controls the option of parsing or not parsing.
Please use it carefully.
Session::has is now deprecated

Use Session::exists instead (standardization of methods name)
Release v1.2.7
Implements Cache core library

Externalize cache from Response
Add cache support for json/xml/text responses

Response class now uses Cache class