Improve walking speed in Fidelity.
Removing commented out code.
Merge pull request #1006 from Microsoft/walkingSpeed

Improve walking speed in Fidelity.
Move away from separate syntax kinds for binary and unary expressions.
Merge pull request #1008 from Microsoft/lessSyntaxKinds

Move away from separate syntax kinds for binary and unary expressions.
Merge branch 'master' into removeUnnecessaryCode