First stab at edit start blocks using blockly (vs a select element)
Use blockly to edit start/toolbox blocks.
Get rid of block stuff
Remove test for blocks.'
Fix tests (remove old fixtures). Add toolbox for editing blocks.
Comments and tests.
Add start direction label.
Get rid of unnecessary migration. Format complete toolboxes better.
Merge pull request #421 from code-dot-org/edit_start_blocks

Edit start/toolbox blocks