design: Previously, the DaffModalService required a DaffModal as an arg to close (the return type of open). This API was probably larger than it should have been, so I trimmed it down. Most consumers won't notice a return type change, but if you do, we can reconsider this change.

category: add injectable fragments and transform support to magento driver (#2828) (0968515)
core: add observe util (#2808) (1874709)
daffio,dgeni: docsgen guides and move under docs namespace (#2824) (47b7345)
design: allow modal to be closed with ESC key (#2812) (e121d40)
design: clean up accordion component and update docs (#2800) (66e9639)
router: add daffRouterComposeGuards (#2809) (075859b)

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