added opencv directory
Revert "add knockout.js directory"

This reverts commit 0187b83e8df2a8ec3e2298129fc432c52e64350a.
Revert "Revert "add knockout.js directory""

This reverts commit 34df627e14c0db5e133d5a535b5531bc64eba15c.
remove .DS_Store
added coffee directory
added node.js directory