Added check_redis_version to check.rake

Created by: axilleas

Since many people install GitLab on old versions of Debian/Ubuntu, an old version (<2.0.0) of redis is installed as well. To avoid confusion and repeated posts in the forum, I added a function to check redis version.

Created by: coveralls

Coverage decreased (-12.32%) when pulling b8b5a698 on axilleas:check-redis into 771b5c22 on gitlabhq:master.

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By Administrator on 2013-04-15T19:04:33 (imported from GitLab project)

By Administrator on 2013-04-15T19:04:33 (imported from GitLab)

Created by: axilleas

First time I used rebase, if I screwed up let me know...

By Administrator on 2013-04-15T19:00:57 (imported from GitLab project)

By Administrator on 2013-04-15T19:00:57 (imported from GitLab)

Created by: coveralls

Coverage decreased (-0.09%) when pulling 06a41513 on axilleas:check-redis into 771b5c22 on gitlabhq:master.

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By Administrator on 2013-04-15T19:19:39 (imported from GitLab project)

By Administrator on 2013-04-15T19:19:39 (imported from GitLab)

Created by: axilleas

Relevant PR #3410

By Administrator on 2013-04-18T09:01:08 (imported from GitLab project)

By Administrator on 2013-04-18T09:01:08 (imported from GitLab)

Created by: dzaporozhets

thank you

By Administrator on 2013-04-18T10:08:15 (imported from GitLab project)

By Administrator on 2013-04-18T10:08:15 (imported from GitLab)