Added blackberry.user.identity docs

Reviewed by Bryan Higgins <bhiggins@blackberry.com>
Add blackberry.io docs

Reviewed by Bryan Higgins <bhiggins@blackberry.com>
Add blackberry.identity
Add pim contacts docs

Reviewed by Bryan Higgins <bhiggins@blackberry.com>
Updated docs with docs team changes
Made changes, added some content that was removed, fixed formatting
Added ui_cover and push
Added io.filetransfer

Reviewed by Bryan Higgins <bhiggins@blackberry.com>
Added notification docs

Reviewed by Bryan Higgins <bhiggins@blackberry.com>