Adding some items for todo.

todo.md

@@ -1,5 +1,10 @@
 
-Operators:
 - $where operator is missing
 - no tests and no description for $bit operator
 - move countable protocol out of core (?)
+- document & test capped collections
+- monger.collection/group is not implemented
+- tell about conflicting modifications
+- use clj-factory
+- modify dynamics through dosync/alter (?)
+- add logging support (java.util.logging is supported by Java driver)