Don't use the KEYS command in redis.

This command is dangerous and often disabled.
Don't crash when using KEYS in sidetiq/web.
Schedule recurring jobs only sidekiq server side

Fixes #104
Lock ice cube to 0.11.1 to fix memory leak errors
Merge pull request #111 from camjackson/master

Lock ice cube to 0.11.1 to fix memory leaks
Merge pull request #106 from nkondratyev/fix_working_with_prefork_servers

Schedule recurring jobs only sidekiq server side
Merge branch 'dont-use-redis-keys' of https://github.com/Connorhd/sidetiq into Connorhd-dont-use-redis-keys

Conflicts:
	lib/sidetiq/schedulable.rb
Merge branch 'Connorhd-dont-use-redis-keys'
Remove Ruby 1.9.3 from travis.yml.
Update CHANGELOG.
Not required since we use redis_pool.
Update CHANGELOG.
Bump to v0.6.2.