Rename GalaxyNexus GM and SkImage expectations for GalaxyS4, remove NexusS

GMs will surely need rebaselining.

BUG=skia:3032

Review URL: https://codereview.chromium.org/683853006
Add wait to amazon page set to avoid tab crashes

BUG=skia:3049
TBR=borenet
NOTRY=true

Review URL: https://codereview.chromium.org/686133002
rework GUI, scripts, and fiddle main for multiple simultaneous configs

You can now select Raster, Ganesh, or both (PDF coming soon), and see
all output simultaneously.

BUG=skia:
R=jcgregorio@google.com
TBR=jcgregorio

Review URL: https://codereview.chromium.org/688433002
scale xmin/xmax etc in fontmetrics

BUG=skia:

Review URL: https://codereview.chromium.org/690533004
fix issues with simultaneous configs and security jail on skfiddle

BUG=skia:
TBR=jcgregorio

Review URL: https://codereview.chromium.org/688003002