Fix #217

Provides a FormParameter annotation replacing @Attribute because the name is better
@Attribute is deprecated from now.

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>
Document the new type support for @Parameter and @FormParameter, the @FormParameter and the @DefaultValue

Signed-off-by: Clement Escoffier <clement.escoffier@gmail.com>