Update README for 1.8 release. Add node 0.9 to travis
README clarifications
Fix 404 link to API docs.
Merge pull request #97 from ests/patch-1

Fix 404 link to API docs.
Merge branch 'master' into dev
Fix header of callbacks.js

Oh, those copy-pastes... :flushed:
Merge pull request #98 from riccieri/patch-1

Fix header of callbacks.js
API docs for when/function
API docs for when/callbacks
API docs for node/function
Grammar and typos
Incorporate @briancavalier's suggestions
Typo
Fix internal links
Merge pull request #99 from riccieri/functional-docs

API docs for the new functional modules