Merge pull request #93 from nanan9177/maze_test

Tested turtle 1, and updated if-blocks and required blocks for levels.
Updated Turtle 1 Level 6 to have ideal number of blocks as 7.
Merge pull request #94 from nanan9177/master

Updated Turtle 1 Level 6 to have ideal number of blocks as 7.
Updated the message for freeplay to hint students to push the space key.
Updated the template files to match with the string. Probably should remove some of them later.
Merge pull request #95 from nanan9177/master

Turtle Free Play Message Update
Fixed the color picker on page http://localhost:3000/s/1/level/37?level=4_2.
Updated required block number on Maze 2 Level 17.
Updated required block number on Maze 2 Level 18.
Fixed the rendering of obstacle.
Added back Turtle 1 Level 10's toolbox.
Corrected Turtle's play level continue button.
Merge pull request #96 from nanan9177/fix_color_picker

Commits that fix some bugs in Maze and Turtle
Fixes start blocks and provides better XML parsing errors.
Merge pull request #97 from brandonbloom/xml-errors

Fixes start blocks and provides better XML parsing errors.
Updated Maze 2 Level 2 so the mouse is facing south.