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Fix the logic block to bump the correct block.

Previously it was always bumping the first block added
even if you are putting the new block over the first block, so it
bumped the new block as well.

Restore thicker scrollbar on touch devices

Update logic block so it is reactive to the input attached to it. (Refactoring coming shortly)

i.e. if you place a number in an input the other input changes it's type to number as well.
When you remove all inputs it reverts back to allowing any input type.

Make the "seats =" block not deletable.

If this block is removed, the puzzle cannot be completed. THis will make a good example users can be pointed to for a use example of setDeletable(boolean).

Don't ignore touch events on iOS 7.1.2 or later.

Fixes google/blockly#40