Support for global `wp-cli.yml` and `wp-cli.local.yml` configs
Fix the `--format` flag for the `wp rewrite dump` command
Fix mysql environment issue.
Lint.
Merge pull request #775 from c10b10/master

Fix environment overwriting for mysql commands
add --field arg to 'wp post get'
add --field arg to 'wp user get'
make Comment_Command extend CommandWithDbObject
Merge pull request #766 from wp-cli/comment-dbobj

Add `wp comment update` subcommand
Merge branch 'master' into field-arg
add --field arg to 'wp comment get'
Merge pull request #776 from wp-cli/field-arg

Introduce `--field` option for `get` subcommands
behat: use Background feature
Merge pull request #780 from wp-cli/behat-background

behat: use Background feature
Adds --skip=image_resize to 'wp import' command.

Gives import user the option to skip image thumbnail generation during
image attachment import. Image resizing is extremely CPU intensive and
makes imports run much slower, especially during test runs that don't
necessarily require all image sizes. Image resizing can always be
deferred post import by running the 'wp media regenerate' command.
account for XDebug not being installed when setting 'display_errors'
Merge pull request #786 from wp-cli/fix-786

No error reporting if XDebug is not enabled
Re-factored patch to work with PHP < 5.4.
pass subcommand implementations as callbacks

This allows child classes to implement only some of the subcommands.
make Site_Command extend CommandWithDBObject