Merge pull request #299 from xtitter/gh-pages

fixing cs10sp14 course page
Updated 'Declaring Variables' page for Besides Blocks lab and added used images
Add quiz for variables and primitive expressions.
Add turtle graphics page
Merge pull request #300 from xtitter/gh-pages

fix problem referencing css files from CDNs
Added turtle graphics exercises
Updated 'Declaring Variables' page
Final changes.
besides block updated lab part 1
updated bjc bb lab 1
updated topic files
Merge pull request #302 from songsok/gh-pages

besides block updated lab part 1
updated bjc bb files and images
Merge pull request #301 from carenthomas/gh-pages

Besides Blocks Lab Sections
Merge pull request #304 from songsok/gh-pages

updated bjc bb files and images
fix the damn topic file
one more update :P
Merge pull request #305 from songsok/gh-pages

one more update :P
tab tweak
fix topic file names