Draft Slides for 2015 APS April Meeting

 Current working version: v7

v3: Updates from Anselm.
v4: Offline updates, and new x range plot.
v5: Updates from Jim, and changes to intro slide. Approved by PWG
v6: Comments from Elke about overall length. Removed two slides about azimuthal modulations.
v7: Swapped bullet points on summary slides as suggested by Gang. Approved by STAR talks.