added snap project, better wording to simplifying tic-tac-toe board
added hints on math in kaleidoscope
fixing images for building-you-own-blocks
Merge remote-tracking branch 'upstream/gh-pages' into gh-pages

* upstream/gh-pages:
  fixing images for building-you-own-blocks
  added hints on math in kaleidoscope
  added snap project, better wording to simplifying tic-tac-toe board
PUSH10 fix a hw wording
added a gitignore file.