Added overview navigation to readme.md
Merge pull request #212 from kevinsimper/master

Created Readme Overview navigation
Clear interval when job is done to avoid 100% progress event being fired continuously.
Changed redis default port to 6379 in Readme.md, closes #122
Merge pull request #216 from fhahn/patch-1

Changed redis default port to 6379 in Readme.md, closes #122
Merge pull request #214 from pilwon/master

Fixed bug in `Parallel Processing With Cluster` example code in `Readme.md`.