Also factor out subtracting_decimals
Proper fix for data-each + graphie/conditionals scoping bug.
Also got rid of the hacks that were in place as a result of this bug in various graphie blocks.
Expand arithmetic's graphie ranges to fit labels.
I want to redo arithmetic properly one day, but I'll let it fester for now.
Small arithmetic housecleaning
Add meta charset to all HTML pages.
fix small graphie issues in subtracting decimals and close #273
Rename EVERYTHING; closes #323.
Shove borrow fxn into graphie-helper
Store labels in graph instead of var so test can stringify
Remove a stray console.log
Add exercise -- subtracting decimals
Strip trailing whitespace
pulled out helpers into math-table.js and cleaned up adding and subtr…
…acting negative numbers
made loop variables local
fixed subtracting_decimals solution