Update docker-dev for consistency with other repos

This updates us to 1.3.1 and updates the tag format to bare version numbers instead of having the "v" prefix.
Merge pull request #304 from tianon/update-docker-dev-for-consistency

Update docker-dev for consistency with other repos
Update docker-library

- `php`: fix some Apache woes (docker-library/php#43), and add `docker-php-ext-install` and `docker-php-ext-configure` (docker-library/php#41)
- `tomcat`: 7.0.57
- `wordpress`: push more of the PHP+Apache logic into `php` where it belongs (docker-library/wordpress#25), and update the image to use the new `docker-php-ext-install` magic for the extra core extensions it needs (docker-library/wordpress#26)
Merge pull request #312 from infosiftr/update-docker-library

Update docker-library
fedora 21 releng-issued image

Image info available here:
http://koji.fedoraproject.org/koji/taskinfo?taskID=7978938

The gz tarball on this page contains the rootfs and metadata.

The xz tarball available at
lsm5/docker-brew-fedora@606897f6b35f4e77b4b386135128385018a7412c
only includes the rootfs.

Signed-off-by: Lokesh Mandvekar <lsm5@fedoraproject.org>

	modified:   library/fedora
Merge pull request #313 from lsm5/fedora-21-beta

fedora 21 releng-issued image