Update API documentation.
Add the evaluateXPath() static method.
Introduce conditions!

New components: <if test="…" />, <elseif test="…" /> and <else />.
Add composer.json.
Dynamically add component on an interpreter
Fix PR.
Use Hoa\Praspel::interprete() static method.
Define flex entities.
Better Composer compatibility.
Add dependency on hoa/router in composer.json