Merge pull request #23 from rafaelcor/master

Added eval block
Merge pull request #24 from rafaelcor/master

Modified advancedblocks.js
Until Block
Merge pull request #26 from DakshShah/master

Until Block
Merge pull request #27 from rafaelcor/master

Added speak block
Merge pull request #28 from rafaelcor/master

Trying to make speak block compatible with chrome
use window scrollTo explicitly
move move code to stage event
Fixing block touch movements, part 1
Moving code ...
added doubleflowclamp artwork
Adding touch enabled
Merge pull request #29 from GhostAlgorithm/master

Fixing block movements on mobile devices part 1
add protoblock for if-then-else
fix palette voffset problem
fix pressup issue on touch
get rid of unneeded event handlers
load thumbnails async
adjust position of else dock
IF then ELSE