Merge pull request #567 from wp-cli/check-version

Check wp-includes/version.php before loading WP
add missing docs for `user add-role`; improve docs for `user set-role`
Update to accommodate scenario when multiple users are passed

See https://github.com/wp-cli/wp-cli/pull/555#discussion_r5179695
Merge branch 'master' into user-first-arg
Update "Generating Users" scenario to accommodate deleting multiple users in one go.
Merge branch 'user-first-arg' of github.com:wp-cli/wp-cli into user-first-arg
rename get_user_from_first_arg() to get_user()
don't abort if a user isn't found
Merge pull request #555 from wp-cli/user-first-arg

`wp user` subcommands should accept `user_login` or `user_id`
simplify user test
extract assoc_array_to_table() utility.

Also:
- unset the 'format_content' field; it can be just as long as
'post_content'.
- unset the 'filter' field; it's a runtime value, not persistent data
implement `wp user get`
behat: align table bars
WP_User->to_array() doesn't exist in WP 3.4
Merge pull request #595 from wp-cli/user-get

Implement `wp user get`
bump version to 0.11.0-alpha2
introduce `wp core multisite-install` (doesn't work yet)
skip ms_site_check() when installing
test both with and without multisite constants scenarios
copy the missing steps from populate_network()