add back the `global()` method to `Context` (used to be in `Scope`)
add back the `global()` method to `Context` (used to be in `Scope`)

rustbridge/neon,rustbridge/neon,dherman/nanny,rustbridge/neon,neon-bindings/neon,rustbridge/neon,dherman/nanny,neon-bindings/neon,neon-bindings/neon,dherman/nanny,neon-bindings/neon,rustbridge/neon,dherman/nanny,rustbridge/neon