Option collectWindowErrors is undocumented and is not supported by RavenOptions type

[jsyrjala]

Option collectWindowErrors is mentioned in #91 and seems to be implemented in the code.

However it is not mentioned in the documentation https://docs.sentry.io/clients/javascript/config/ nor it is supported by RavenOptions in https://github.com/getsentry/raven-js/blob/master/typescript/raven.d.ts#L10

• https://github.com/getsentry/raven-js/blob/master/src/raven.js#L59
• https://github.com/getsentry/raven-js/blob/master/src/raven.js#L187

[kamilogorek]

Addressed in #1050