Adds in dropdown block in first scenario and begins to add linear building functionality to the graph.
Adds some checks to prevent terminal blockly configurations.
Trying some things...
We now have y=mx+b :)
Fixes and aesthetic improvements to operators representation.
Change colors and default block values.
Handles NaN inputs to number blocks.
Prevents starting with an arithmetic operator
Split + - and * / into their own blocks.
Changed number block color.
Merge pull request #205 from virtual-world-framework/new-blockly-blocks

New Blockly Blocks