update deprecated deps

[juliangruber]

getting a couple warnings on a fresh npm install:

npm WARN deprecated buffer-browserify@0.2.5: Package not maintained. Recent browserify uses https://github.com/feross/buffer
npm WARN engine dissolve@0.3.3: wanted: {"node":"~0.10.0"} (current: {"node":"5.4.1","npm":"3.3.12"})
npm WARN deprecated jade@0.26.3: Jade has been renamed to pug, please install the latest version of pug instead of jade
npm WARN deprecated graceful-fs@2.0.3: graceful-fs v3.0.0 and before will fail on node releases >= v7.0. Please update to graceful-fs@^4.0.0 as soon as possible. Use 'npm ls graceful-fs' to find it in the tree.
npm WARN deprecated npmconf@0.0.24: this package has been reintegrated into npm and is now out of date with respect to npm

[juliangruber]

i'm working on this

[juliangruber]

except for buffer-browserify there's not much we can do about this. mocha wants to keep supporting node 0.8