role: Update role list to properly format roles in a table
run core install-network when WP_MULTISITE=1
Add note about serialized values in search-replace man page

[ci skip]
Replace WP_MULTISITE env variable with a 'Given a WP multisite install' step
Merge pull request #357 from wp-cli/test-multisite

The WP_MULTISITE env variable isn't used
Update man file
Merge pull request #355 from wp-cli/role-list-format

role: Update role list to properly format roles in a table
tests: escape arguments passed in run_sql()
add $assoc_args parameter to _run(), for convenience
transparently add additional assoc params to special commands, instead of having dedicated methods
use create_cmd() utility in download_wordpress_files()
first pass at multisite.feature
don't test against WP 3.4.2 using PHP 5.4

It avoids this warning:

Creating default object from empty value in /wp-admin/includes/schema.php on line 922
test deleting a blog
add --porcelain flag to `blog create`
make `blog delete` accept a blog id as well
update man page for blog delete

[ci skip]
fix success message for `blog delete`
add 'Delete a blog by slug' scenario
Merge pull request #359 from wp-cli/test-multisite

Add tests for `wp blog`