Allow block xml disable tag to be more accepting
Allow block xml disable tag to be more accepting

twodee/blockly,mark-friedman/blockly,trinketapp/blockly,picklesrus/blockly,twodee/blockly,google/blockly,rachel-fenichel/blockly,trinketapp/blockly,mark-friedman/blockly,google/blockly,mark-friedman/blockly,rachel-fenichel/blockly,rachel-fenichel/blockly,jstnhuang/blockly,nickmain/blockly,mark-friedman/blockly,rachel-fenichel/blockly,google/blockly,twodee/blockly,twodee/blockly,rachel-fenichel/blockly,trinketapp/blockly,google/blockly,joshlory/blockly,picklesrus/blockly,mark-friedman/blockly,mark-friedman/blockly,google/blockly,picklesrus/blockly,trinketapp/blockly,joshlory/blockly,nickmain/blockly,nickmain/blockly,google/blockly,twodee/blockly,rachel-fenichel/blockly,jstnhuang/blockly,joshlory/blockly,rachel-fenichel/blockly,twodee/blockly,jstnhuang/blockly,jstnhuang/blockly,google/blockly,nickmain/blockly,nickmain/blockly,nickmain/blockly