Fedora 21 release image, point fedora:latest to 21

The official fedora 21 image koji build can be found here:
http://koji.fedoraproject.org/koji/taskinfo?taskID=8289768

This commit also points fedora:latest to fedora:21

Update URLs to point to fedora-cloud account repo.

Signed-off-by: Lokesh Mandvekar <lsm5@fedoraproject.org>
Merge pull request #342 from fedora-cloud/fedora21-release

Fedora 21 release image, point fedora:latest to 21
cleanup fedora image repo Re: PR#342

Signed-off-by: Lokesh Mandvekar <lsm5@fedoraproject.org>
Bump jruby 1.7.17
Merge pull request #343 from fedora-cloud/fedora-21-release-2

cleanup fedora image repo Re: PR#342
Remove unreliable dev build

Building from the jruby git repo seems to try to pull artifacts from
other locations, which breaks every so often.
Merge pull request #344 from cpuguy83/bump_jruby_1.7.17

Bump jruby 1.7.17
Add new Travis stuff so PRs only test the bits that have changed
Merge pull request #345 from infosiftr/new-travis-magic

Add new Travis stuff so PRs only test the bits that have changed
Fix Travis "bashbrew/" change detection
Merge pull request #349 from infosiftr/fix-travis

Fix Travis "bashbrew/" change detection
Update docker-library

- `docker-dev`: 1.3.3
- `golang`: 1.4 (remove 1.2, update `:latest` to be 1.4)
- `mariadb`: 10.1.2
- `mongo`: 2.6.6
- `mysql`: `MYSQL_ALLOW_EMPTY_PASSWORD`
- `node`: NPM 2.1.11
- `python`: 2.7.9
- `redis`: 2.8.18
Merge pull request #348 from infosiftr/update-docker-library

Update docker-library
Update ubuntu

- `ubuntu:precise`: 20141210
- `ubuntu:trusty`: 20141210
- `ubuntu:utopic`: 20141210
- `ubuntu:vivid`: 20141214
Merge pull request #351 from tianon/ubuntu

Update ubuntu
Add WebSphere Liberty image