Downgrade esprima due to dependency resolution error.
Downgrade esprima due to dependency resolution error.

"No compatible version found: esprima@'^1.1.1'" on Node 0.8 build.

twada/power-assert,saneyuki/power-assert,azu/power-assert,twada/power-assert,power-assert-js/power-assert,saneyuki/power-assert,falsandtru/power-assert,yagitoshiro/power-assert,yagitoshiro/power-assert,falsandtru/power-assert,power-assert-js/power-assert,azu/power-assert