devkit: amber-cli minor fix in final require call

Uses require(["amber/_init"]), not require("amber/_init").
devkit/amberc: internal var vm->core
devkit/amberc: removing old debug log
devkit/amberc: {vm,globals}->{$core,$globals} ...

... in concatenated node.js program 'main' section.
devkit: Release 0.2.2.
bump amber-dev depenedency to 0.2.2.
Prerelease 0.13.0-beta
cli: bump dev dependencies to 0.13.0-beta
cli: Prerelease 0.13.0-beta