Fixed issue: Fixed HTTP header constructor

This small fix must help run Gleez in hiphop-php.

Argument 2 passed to ArrayObject::__construct() must be an instance of int
See http://php.net/manual/en/arrayobject.construct.php
Updated feature: Amended Gravatar config
Updated feature: Gleez Gravatar v1.4.1

+ Redesign Gravatar::download - For security reasons,
  removed the display destination for downloading the file when an
  exception occurs. Corrections in the logic of the algorithm

+ Updated Gravatar config
New feature: Added Valid::range_length
Updated feature: Moved Num::inRange to Valid::in_range
Update Issue #373:  Removed Gleez namespace for Session_Db
Update Issue #373: Removed system/session
Fixed issue: Cleanup PHPDoc, use Config::get
Updated feature: Cerber Theme
Bump version
Merge pull request #507 from sergeyklay/master

Fixes & Additions