Fix for issue #712

Fix for issue #712. The specific issue mentioned there concerns providing a more helpful error message when the ^ operator is used with 2 boolean operands. My change is slightly more general in that it generates an error for &, &=, ^, ^=, |, and |=. I used the error message mentioned in the issue:

"error TS0000: The ^ operator is not allowed for boolean types. Consider using !== instead."

When & or | are used with boolean values I suggest && and || respectively.

One interesting thing here is how to handle the assignment operators. Right now I show the same recommendation i.e. "consider using !==" shows up for both "^" and "^=" which, is maybe a bit confusing, but I wasn't sure the best way to do this. I've spoken briefly with @DanielRosenwasser about this but would be open to any other feedback for how to handle this. 
please don't place comments above 'else' blocks.  Just put it inside the else block.  Thanks!