Delete some code that was added back in a merge and print less info in
spark-daemon
Various web UI improvements:

- Use "fluid" layout that can expand to wide browser windows, instead of
  the old one's limit of 1200 px
- Remove unnecessary <hr> elements
- Switch back to Bootstrap's default theme and tweak progress bar colors
- Make headers more consistent between deploy and app UIs
- Replace some inline CSS with stylesheets
Print output from spark-daemon only when it fails to launch
Small tweak
Small fixes to README
Merge pull request #880 from mateiz/ui-tweaks

Various UI tweaks
Added stageId <--> jobId mapping
DAGScheduler:
  - style fixes
  - clearOldValues for new TimeStampedHashMaps
  - log unexpected cleanup of data structures
  - cleanup stageToInfos and stageIdToLogIds
cleanup
Added empty data structure checks to DAGSchedulerSuite
Clean up after jobs run locally
Clean up shuffleToMapStages
Fixed SPARK-864 -- don't submit a stage that no active job needs
Cleanup and comments
Minor cleanup