5.0 fixes / changes

[alkrun]

I was looking back through this and I missed a change that I had made.

At the end of the op section, where I call buffer.clear(), that needs to be moved outside of the if(!op) block, and the op = ch above it is redundant. So what was:

            }; 
            op = ch;//save current operator and continue parsing 
            buffer.clear();//clear buffer now that we're starting on a new number 
         } 
         op = ch; 
      }

should be:

            }; 
         } 
         buffer.clear();//clear buffer now that we're starting on a new number
         op = ch; 
      }