Updated Logging and error handling (markdown)

Logging-and-error-handling.md

@@ -1,4 +1,4 @@
-One unfortunate thing when using some third-party libraries is that they usually pollute the console with their own logging mechanisms. CoreStore provides it's own default logging class, but you can plug-in your own favorite logger by implementing the `CoreStoreLogger` protocol.
+One unfortunate thing when using some third-party libraries is that they usually pollute the console with their own logging mechanisms. CoreStore provides its own default logging class, but you can plug-in your own favorite logger by implementing the `CoreStoreLogger` protocol.
 ```swift
 final class MyLogger: CoreStoreLogger {
     func log(#level: LogLevel, message: String, fileName: StaticString, lineNumber: Int, functionName: StaticString) {
@@ -20,13 +20,7 @@ CoreStore.logger = MyLogger()
 ```
 Doing so channels all logging calls to your logger.
 
-Note that to keep the call stack information intact, all calls to these methods are not thread-managed. Thus you have to make sure that your logger is thread-safe or you may otherwise have to dispatch your logging implementation to a serial queue.
-
-## <a id="observing"></a>Observing changes and notifications
-CoreStore provides type-safe wrappers for observing managed objects:
-
-- `ManagedObjectController`: use to observe changes to a single `NSManagedObject` instance (instead of Key-Value Observing)
-- `ManagedObjectListController`: use to observe changes to a list of `NSManagedObject` instances (instead of `NSFetchedResultsController`)
+Note that to keep the call stack information intact, all calls to these methods are **NOT** thread-managed. Therefore you have to make sure that your logger is thread-safe or you may otherwise have to dispatch your logging implementation to a serial queue.
 
 
 ## Contents