Start integer sum exercise
Working integer sum exercise
Implemented some suggestions
Improved final hint
Add case-insensitive flag to regex answer type
Create implicit_differentiation.html
Update exercises/implicit_differentiation.html
Starting to mark up utility libraries for translation.
Switch to using $.ngettext for plural strings.
Forgot to add in the new i18n.js utility.
Update exercises/implicit_differentiation.html
Continue marking up exercise utility files.
Adding *.py to .gitignore
Trying to return .gitignore to the way it was
New hints for solve-older-1 problems
New hints for solve-younger-1
New hints for solve-older-2 problems
New hints for level 3 problems
Slightly changed 4 and 5 to match style of previous problems
Added colors to solve-older-1 problems