ReplaySubject should have a method for clearing items from the buffer

[JamesJansson]

Pretty self explanatory. Sometimes you want to remove items from the buffer, if the items are no longer useful. e.g. the user clears the history of recently entered search terms.

I would propose a simple function, such as .clearBuffer() which would work in a similar way to _trimBuffer() but simply calls _buffer.splice(0,_buffer.length);

Is there any reason why this would be a bad idea or unwelcome? I am willing to write this if this concept is generally accepted.