Changed connections to handle disposing of connected blocks.
Changed connections to handle disposing of connected blocks.

mark-friedman/blockly,picklesrus/blockly,google/blockly,google/blockly,mark-friedman/blockly,picklesrus/blockly,mark-friedman/blockly,google/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,google/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,mark-friedman/blockly,google/blockly,mark-friedman/blockly,picklesrus/blockly,mark-friedman/blockly,rachel-fenichel/blockly,google/blockly,google/blockly