Renames `escapeForCss` to the less-nice but more-precise `escapeCssIdForSelector`.
Fixes capLength for SC.ScrollerView.

The updated value from previous patch was incorrect, and caused the thumb
to overlap the cap.
Enhance SC.Request/SC.Response to support XHR responseType.

XMLHTTPRequest level 2 adds support for using the responseType property
to indicate what type of data the request will return. This allows getting
JSON, Blob, or ArrayBuffer data directly off the response property.
Bumping to SC 1.9.0.23.