Update `cache` command docs, based on docopt.org.

Related to issue #124.
Update `new` command docs, based on docopt.org.

Related to issue #124.
Update `reset` command docs, based on docopt.org.

Related to issue #124.
Update `start` command docs, based on docopt.org.

Related to issue #124.
Update `uninstall` command docs, based on docopt.org.

Related to issue #124.
Update `install` command docs, based on docopt.org.

Related to issue #124.