Added three new levels at the end of Karel 2 regarding the towers. The toolbox as well as instructions and feedback need to be updated, waiting to do this after the order of the levels are discussed.
Updated Karel instructions for all the levels reflecting the new levels as well as the reordering of the existing levels.
Switched Karel 1 Level 4 and Level 5.
Made the while block's default option to be path ahead for Karel 1 Level 8 and 9.
Added remove 3 function block in Karel 2 Level 5 as the start blocks.
Added the if block as the start block for Karel 2 Level 11. Give the students some hint on using the if block.
Updated the hint messages for Karel 1 based on the new order of the levels.
Replace Karel 2 Level 1 with Karel 2 Level 10. Moved Karel 2 Level 9 to the end of the tutorial. There are 11 levels in Karel 2 now, but we only show the first 10 levels to the students. (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 --> 10, 2, 3, 4, 5, 6, 7, 8, 11, 12, 9)
Speeded up levels that need a lot of steps.
Updated the feedback messages for Karel 2.
Merge pull request #18 from nanan9177/new_feature

Added the Tower Levels and Moved existing levels around