Updating less and marked packages

Still a few outdated modules, I only did the "risky" ones. Let me know if you want a new, generic bug for the other outdated modules.
Current output:
```sh
$ npm shrinkwrap --dev
wrote npm-shrinkwrap.json

$ nsp shrinkwrap
No vulnerable modules found

$ npm outdated --depth 0 | sort
Package        Current  Wanted     Latest  Location
autoprefixer     2.2.0   2.2.0      3.1.0  autoprefixer
coffee-script    1.7.1   1.7.1      1.8.0  coffee-script
jade            0.35.0  0.35.0      1.7.0  jade
mocha            1.8.2   1.8.2     1.21.4  mocha
node-sass        0.9.3   0.9.3  0.9.5-rc1  node-sass
should           1.2.2   1.2.2      4.0.4  should
stylus          0.47.3  0.47.3     0.49.1  stylus
```