Only showing scheduled jobs that match current env or omit env

Fixes #86
Merge pull request #367 from resque/86-show-jobs-for-current-env-only

Only showing scheduled jobs that match current env or omit env
Merge branch 'v2.x-stable' into merging-v2.x-stable

Conflicts:
	lib/resque_scheduler/server.rb
	test/resque-web_test.rb
Ensuring lock and acquire lua scripts are refreshed on timeout change
Merge pull request #371 from resque/299-update-resilient-lock-lua-scripts-with-timeout

Ensuring lock and acquire lua scripts are refreshed on timeout change
Merge remote-tracking branch 'upstream/v2.x-stable' into merging-v2.x-stable
Merge pull request #370 from resque/merging-v2.x-stable

Merging v2.x stable