Added the wp directory that contains the Wordpress

The wp dir will contain all the Wordpress files, but Wordpress itself is
managed (downloaded/updated/installed) via "wp-cli".
Added files from the Wordpress-Skeleton structure

Using the structure from the Worpdress-Skeleton repo, but not using wp
as a module. WP is managed via wp-cli.
Updated .gitignore
Added the default Wordpress .htaccess dir
Added an script for creating and linking writable dirs

The create-shared-dirs.sh file creates an "shared" dir with some dirs
within it. Those dirs are for uploading and caching. And after they are
created, they are symlinked to the content-dir.
Added the "register-theme-directory.php" mu-plugin.

This plugin lets Wordpress know that it should use its own themes
directory, as wel as the one in the root/content/themes dir.
Added the empty index.php to prevent directory listing
Added the two empty index.php files in plugins and themes dir.
Ignoring content/cache and content/uploads
Igoring content/cache and content/uploads and shared
Added a MU plugin to remove the annoying admin bar
Created a script to install some common plugins

This script will install a few plugins almost every Wordpress
installation needs.
Moved scripts to a scripts dir :-)
Fixed a typo in the name of install plugins script
Ignoring memached.php and content/plugins contents
Disabled caching, while we are developing

And we don't have any caching plugin installed yet, so setting WP_CACHE
to true, does not work.
Updated the install plugins script to add an option for the social
plugin

And disabled the caching plugin, because it was generating errors
Added a script to download and install wordpress

This script does "wp core download" and after that it also does the
installation, by asking the user for the url, title and admin details.

After installation, we also set some default options to which I think it
is better (during development).
Re-enabled the "wp core download" instruction

This instruction was disabled for testing the installation instruction,
where WP itself was already downloaded
Merge branch 'master' of github.com:schmkr/wp-skeleton-cli

* 'master' of github.com:schmkr/wp-skeleton-cli:
  Updated the README.md
  Initial commit