Fix embedded attribute name for YAML and XML

Documentation was ok, but drivers where partially correct
Add the ability to generate absolute/relative URIs

on (Paginated|RouteAware)Representation

Also, refactor the tests for these classes
Merge pull request #118 from willdurand/representation-uris

Representation uris
Rename method getAbsolute() -> isAbsolute() in RouteAwareRepresentation
PagerfantaFactory now supports absolute URIs
Fix doc for @Route
Fix doc: XmlHalSerializer => XmlSerializer
Fix CS
Fix how context variables are set using the builder
Allow to set context variables using ExpressionEvaluator's constructor
fix PHPDoc for ClassMetadata
Add PHPDoc on ClassMetadata
Add latest stable version badge
Support curies in JsonHalSerializer
Merge pull request #121 from willdurand/curies

Support curies in JsonHalSerializer
Keep embedded relations even with custom relations

Fix issue #122
Allow users to add expression functions
Refactor tests related to serializers and JSON content
fix tests for PHP 5.3
Merge pull request #125 from willdurand/fix-tests

fix tests for PHP 5.3