Refactor: pipeline -> pipe
New event system
Makefile: Add test target
feat(plugin): new plugin system

Plugins are now separate processes connected via RPC and an event
connection using unix sockets.

Closes #12, Closes #9, Closes #6, Closes #5, Closes #3, Closes #2, Closes #1
docs(pipe): watcher and reactor interface documentation
docs(plugins): add readme on plugin building
docs(plugins): doc serving a plugin and syntax highlighting fix
docs(plugins): fix links to source
Serf watcher first draft
Add Serf watcher
Serf watcher using bookkeeper
refactor(watcher-serf): update to new plugin structure