* allow model describers on jms custom types
* add fallback describer
* test custom type def
* remove object_fallback describer from the container when jms is not active
* fix missing variable definition
* fix caching typo
* do not pre allocate reserved names
* use model hash instead of spl hash
* register later the model
* [JMSModelDescriber] Allow to use free form objects from JMS serialization
* Remove unused variable
* Refactor `describeItem()`
* Add more tests
* early detect of free form objects
* Add test for array property without type
* Merge `findPropertyType()` and `registerPropertyType()` methods
* Update `registerPropertyType()` in order to set "object" as type for arrays with undefined item types
* Set "additionalProperties" definition for arrays without defined items
* Simplified `registerPropertyType()`
* Merged `registerPropertyType()` into `describeItem()`
* Fix comment
* Fix comment
* if the group does not define per property exclusion, then remove possible obsolete property exclusions
* if the group is using only the default group, then is as not defining a group
* test that the user does not get a new alias just because another property pf the same object has some groups
* use strict comparison
* Add some missing property attributes for JMS model describer
* Introduce own Swagger definition annotation reader
* Shorten annotation mapping by using merge
The type invariation (changing from the real property to the sub items
definition) causes the swagger annotations to end up on the created
`Items` entry.
This changes the behaviour to update the real property entry with the
swagger annotation.
Additionally this ensures that "description", "title" and "example" are
only updated on `Schema` instances.
* support swagger property annotation to descripe properties of model
* support swagger property annotation to descripe properties of model
* fix issues from PR review
* rename method
* remove redundant annotations and revert changes into composer.json
* fix issues from PR comments
* use symfony 3 for default tests
* revert chages
* use symfony 3 for default tests
* revert changes in travis config
