[3/3] spark git commit: [SPARK-7500] DAG visualization: move cluster labeling to dagre-d3

[andrewor14]

[SPARK-7500] DAG visualization: move cluster labeling to dagre-d3

This fixes the label bleeding issue described in the JIRA and pictured in the 
screenshots below. I also took the opportunity to move some code to the places 
that they belong more to. In particular:

(1) Drawing cluster labels is now implemented in my branch of dagre-d3 instead 
of in Spark
(2) All graph styling is now moved from Scala to JS

Note that these changes are related because our existing mechanism of "tacking 
on cluster labels" afterwards isn't flexible enough for us to fix issues like 
this one easily. For the other half of the changes, visit 
http://github.com/andrewor14/dagre-d3.

-------------------

**Before.**
<img 
src="https://cloud.githubusercontent.com/assets/2133137/7582769/b1423440-f845-11e4-8248-b3446a01bf79.png";
 width="300px"/>

-------------------

**After.**
<img 
src="https://cloud.githubusercontent.com/assets/2133137/7582742/74891ae6-f845-11e4-96c4-41c7b8aedbdf.png";
 width="400px"/>

Author: Andrew Or <and...@databricks.com>

Closes #6076 from andrewor14/dag-viz-bleed and squashes the following commits:

5858d7a [Andrew Or] Merge branch 'master' of github.com:apache/spark into 
dag-viz-bleed
c686dc4 [Andrew Or] Fix tooltip placement
d908c36 [Andrew Or] Add link to dagre-d3 changes (minor)
4a4fb58 [Andrew Or] Fix bleeding + move all styling to JS

(cherry picked from commit 65697bbeafe507dda066e2dc14ca5183f278dfe9)
Signed-off-by: Andrew Or <and...@databricks.com>


Project: http://git-wip-us.apache.org/repos/asf/spark/repo
Commit: http://git-wip-us.apache.org/repos/asf/spark/commit/a2361045
Tree: http://git-wip-us.apache.org/repos/asf/spark/tree/a2361045
Diff: http://git-wip-us.apache.org/repos/asf/spark/diff/a2361045

Branch: refs/heads/branch-1.4
Commit: a23610458c46aaec08d01db444abd1551bcae823
Parents: ec89286
Author: Andrew Or <and...@databricks.com>
Authored: Tue May 12 11:17:59 2015 -0700
Committer: Andrew Or <and...@databricks.com>
Committed: Tue May 12 11:18:08 2015 -0700

----------------------------------------------------------------------
 .../org/apache/spark/ui/static/dagre-d3.min.js  | 14 ++--
 .../org/apache/spark/ui/static/spark-dag-viz.js | 79 ++++++++------------
 .../scala/org/apache/spark/ui/UIUtils.scala     |  2 +-
 .../spark/ui/scope/RDDOperationGraph.scala      | 40 +++-------
 4 files changed, 48 insertions(+), 87 deletions(-)
----------------------------------------------------------------------



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