Add browse-kill-ring package
Adds comments to sample modules.
Updates key chord bindings.
Merge pull request #457 from climatewarrior/updateKeyChords

Updates key chord bindings.
Merge pull request #456 from climatewarrior/add-module-docs

Adds comments to sample modules.
Enable browse-kill-ring's default keybindings
Merge branch 'master' of github.com:bbatsov/prelude
Merge branch 'master' into rock-mac