Implement getName to make sonata admin happy

When using the admin to manage blocks you need to implement getName
Merge pull request #3 from uwej711/admin

Implement getName to make sonata admin happy
fix phpdoc
fix setParent method signature to match BlockInterface
added createphp mappings
moved docs to http://symfony-cmf.readthedocs.org/en/latest/bundles/block.html
Update README.md
updated docs url
typo fixes to match upstream interfaces
added multi lang simple block
added MultilangSimpleBlock rdf mapping
added admin for ContainerBlock, SimpleBlock and MultilangSimpleBlock
added admin for ReferenceBlock
added admin for ActionBlock
tweaked locales in admin list
cosmetics
removed implicit dependency on the ContentBundle
auto detect if the createphp twig function is available
Add locale choice for MultilangSimpleBlock
Add some validators