[SPARK-7371][SPARK-7377][SPARK-7408] DAG visualization addendum (#5729)#5954

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andrewor14 wants to merge 6 commits intoapache:masterfrom

andrewor14:viz-emphasize-rdd

Commits on May 6, 2015

Implement cluster padding for stage page
Andrew Or
committed
Tweak background color, stroke width, font size etc.
Andrew Or
committed
Move styling from JS to CSS + clean up code
Andrew Or
committed
Clean up code
Andrew Or
committed
Merge branch 'master' of github.com:apache/spark into viz-emphasize-rdd
Andrew Or
committed
Guard against JS error by rendering arrows only if needed
Andrew Or
committed