Add documentation on rbt land.

Review Request #6724 — Created Jan. 2, 2015 and submitted — Latest diff uploaded

Information

RBTools
master
895de50...

Reviewers

This adds a doc page on rbt land, covering basic usage options for
remote and local changes, editing commit messages, pushing changes, and
all supported options.

Built the docs and read through it. Checked that the links were correct.