Added more properties/types to the angular_ui_router.js externs.
Updated annotations to match appropriate style/rule.
Hardened some of the type definitions for ui.router.$state.
Updated some string params to make them optional, where applicable.
Added dlochrie to Contributors file. Added @typedef for $state.go optional param.
Fixed syntax in @typedef for GoOptions.
Replaced optional-typed object with `undefined`.
Added "undefined" to optional properties on @typedef for GoOptions_. Updated params definition for `options` on $state.go.
Merge pull request #744 from dlochrie/master

Added more properties/types to the angular_ui_router.js externs.