Added dictionary-style access to documents

Added __init__.py info to package, moved TopLevelDocumentMetaclass
to base.py, added tests for dictionary-style access.

mongomap/document.py

@@ -1,30 +1,7 @@
-from base import DocumentMetaclass, BaseDocument
+from base import DocumentMetaclass, TopLevelDocumentMetaclass, BaseDocument
 
 #import pymongo
 
-class TopLevelDocumentMetaclass(DocumentMetaclass):
-    """Metaclass for top-level documents (i.e. documents that have their own
-    collection in the database.
-    """
-
-    def __new__(cls, name, bases, attrs):
-        # Classes defined in this module are abstract and should not have 
-        # their own metadata with DB collection, etc.
-        if attrs['__module__'] != __name__:
-            collection = name.lower()
-            # Subclassed documents inherit collection from superclass
-            for base in bases:
-                if hasattr(base, '_meta') and 'collection' in base._meta:
-                    collection = base._meta['collection']
-
-            meta = {
-                'collection': collection,
-            }
-            meta.update(attrs.get('meta', {}))
-            attrs['_meta'] = meta
-        return DocumentMetaclass.__new__(cls, name, bases, attrs)
-
-
 class EmbeddedDocument(BaseDocument):
     
     __metaclass__ = DocumentMetaclass