Updates reducer example and details command-line in KijiMR userguide.

Signed-off-by: Milo <milo@wibidata.com>
Fix data_generator.py command line
Improves Gatherer section, cleans up some things in Producer section.

Signed-off-by: Christophe Taton <taton@wibidata.com>
Adds a link to create a JIRA issue for docs.
Added metadata section to CLI
DOCS-26. Update phonebook tutorial for rc4.

Signed-off-by: Juliet Hougland <juliet@wibidata.com>
Small textual edits.  Feel free to reject the changes you don't like, I know they're subjective.

Signed-off-by: Juliet Hougland <juliet@wibidata.com>