Use `wp_parse_args()` where we can
Merge branch 'master' of git://github.com/wp-cli/wp-cli
Add is-installed command to wp-cli
First pass at Behat test for `wp plugin is-installed <plugin>`
Fixed test for `wp plugin is-installed <plugin>`

There was extra white space in the expected output
Merge pull request #649 from joshbetz/master

Add is-installed command to wp-cli
site list: add --format=url; see #661
allow passing 'php://stdin' to WP_CLI\Iterators\CSV
combine 'domain' and 'path' fields into single 'url' field; remove --format=url

see #661
remove stray print_r()
update tests for 'wp site list'. see #661
behat: extract compareTables() helper
Correct `wp user add-role` example
Merge pull request #675 from trepmal/patch-1

Correct `wp user add-role` example
add support for PsySH in `wp shell`

also, replace Boris as suggested package
Merge pull request #640 from wp-cli/psysh

Support PsySH in `wp shell`
Merge branch 'master' of git://github.com/wp-cli/wp-cli
Let's use the simpler `array_merge()` instead of `wp_parse_args()`
Merge pull request #643 from johnbillion/master

Use `wp_parse_args()` where we can
Don't pretend we're in wp-admin, but continue to load all admin APIs.

The WP_CLI context is not like the WP_ADMIN context. It's a different
animal.

See #674 for more details.

Fixes #477, #519, #574, #579, #582, #669