Update composer packages

* composer/installers v1.0.12
* wp-cli/wp-cli v0.14.1
* vlucas/phpdotenv 1.0.6
Add 1.1.1 notes to CHANGELOG
Remove trailing slash from WP core theme directory

Default uses `get_theme_root()` which doesn't have a trailing slash. Fixes a double slash `//` issue for default theme assets as well.

Note: this never affected themes in `app/themes/`.
Remove WP-CLI and add a note about usage
Add wp-cli.yml file
Merge pull request #54 from roots/remove-wp-cli

Remove WP-CLI and add a note on usage
Add wordpress namespace for wordpress package
Merge pull request #55 from roots/wp-roots-vendor

Add wordpress namespace for wordpress package
Update CHANGELOG
Update to WordPress 3.8.2
Bump to 1.2.1
Check if .env exists before running dotenv on it.
Merge pull request #56 from DArtagan/dotenvcheck

Check if .env exists before running dotenv on it.
Update CHANGELOG
Update to WordPress 3.8.3
wordpress 3.9
Secure Wordpress.org connection
Merge pull request #61 from ShutterBrandon/master

Update to Wordpress 3.9
Update README with bedrock-ansible project info
Update composer.lock with wordpress 3.9 so it doesn't break on create-project