delete CA file
only when CA file is copied

could be `if ( ! empty( $options['verify'] ) ) {`
Fix term delete example
Update core.php
Merge pull request #1335 from mattheu/fix-term-delete-example

Fix term delete example
Merge pull request #1322 from szepeviktor/patch-8

delete CA file
Explicit support for importing remote CSVs

It worked before, but threw a warning that the file was missing.
Throw an explicit warning when the file doesn't exist

The iterator will eventually error anyway. Let's do this before we get to that.
Make this error more explicit by including response code
Add tests for error case
Test case for remote csv error
Merge pull request #735 from wp-cli/remote-import-csv

`wp user import-csv` should support remote files
Allow themes and plugins to be listed with `update_version`

When there's no `update_version` available, the attribute is `null` on the plugin info array.
`isset()` returns false for null values, but `array_key_exists()` and `property_exists()` do the job
Check if `Spyc` exists before including it

Other projects may have included it via Composer, and this will prevent a fatal
Make it clearer where the `function_exists()` check ends
Merge pull request #1351 from wp-cli/allow-null

Allow themes and plugins to be listed with `update_version`
More clearly specify which fields are available on a cron event
Prevent error notices when these variables aren't set
Tests for 537c60a96e03b6c47489cc330f772955064aad09
Merge pull request #1350 from wp-cli/spyc-exists

Conflict with lespoilus/spyc when installed with composer