Support Converter for EmbeddedDocumentListField

[bekab95]

I was using mongoengine for Flask Admin and needed support for EmbeddedDocumentListField

May this also needs additional details to be added ? for example I have not yet tested querying
Needs Implementation of methods mentioned in mongoengine docs.

class EmbImages(EmbeddedDocument):
    image = ImageField()
    comments = StringField()

class EmbedStrings(EmbeddedDocument):
    stri = StringField()

class Imgs(Document):
    images = EmbeddedDocumentListField(EmbImages)
    com = StringField()
    coms = EmbeddedDocumentListField(EmbedStrings)