Rewrite Cas class
Better handle of cas namespace
Rename cas exception to be more generic
Cas is not anymore static, add unittests
Use require_once
Add requires php 5.4 in CasTest
Cast string better
Move httpful pckg in 'require' section
Handle special chars for  &
merge
Merge pull request #273 from trecouvr/rewrite-cas

Rewrite Cas class