Update README.md

Add dependancies status badge (all green, congrats!).
Thanks
pin minitest to version 4 so the tests will run
ignore stdout file created in tests
remove deprecated redis 'glueoutputbuf' option
fix mocha include warning
add .ruby-version file
require resque >=  1.25
remove dependence on Resque::Helpers
use https rubygems source
Merge pull request #86 from teeparham/fix_tests

Fix tests
Merge pull request #87 from teeparham/resque125

Remove dependence on Resque::Helpers, require resque 1.25
Change rubies travis-ci.org tests against.
Merge pull request #88 from teeparham/rubygems_source

use https rubygems source
Drop 1.9.2 from travis-ci.org builds, remove devel dependencies no-longer needed.
Merge pull request #75 from gravis/patch-1

Update README.md to include Gemnasium badge.
Merge https://github.com/lantins/resque-retry