KijiMR user-guide: HFile section
Adds links to javadocs in both tutorials.

Signed-off-by: Juliet Hougland <juliet@wibidata.com>
Fixes accordions in music tutorials.
Adds working with Avro section to KijiMR userguide.

Signed-off-by: Milo <milo@wibidata.com>
Edits to Setup and PlayCount pages
reviewed by: Lee

Signed-off-by: Daisy Zhou <daisy@wibidata.com>
Fixed phonebook tutorial links.