Update activity.js

Adding 'while' block
Update basicblocks.js

Adding 'while' block
Update activity.js
Update activity.js
Merge pull request #16 from drakosvlad/master

Adding 'while' block
we use makeButton in blocks.js
Merge branch 'master' of github.com:walterbender/turtleblocksjs
improved artwork for boolean 1 arg
Merged