Added Hal Pager
Enhance service configuration

- Inherit HalPagerfanta Service definition
Added unit test
Removed unused namespace
Avoid inheriting from Pagerfanta
Using HalPagerfanta is now xml friendly
Remove useless HalPagerfantaHandler dependencies
Add create() to HalPagerfanta
Merge branch 'hal_pager' closes #18
Fixes #23
Fix tests
Fix tests
Add addRelation to RelationsManagerInterface
Fixed CS issues
Merge pull request #24 from Ninir/fixes

Fixed CS issues
Serialized links now work correctly with exclusion strategies