[WIP] created a dataview based on the Symfony Form component
decoupled the registry from the form extension, and instead created a new instance
of the form extension with types special for the dataview bundle
updated readme
fixed composer.json
added some readme stuff on guessers
when the value is null, don't serialize compound
fixed data_class for date and time fields
added a convenience method: addFixed
bugfix
allow chaining
added the 'float' type
better resolving of data class for entity type
added number guesser
set a branch alias