Merge pull request #393 from doowb/master

Moving plugin stage
fixes plugin stage `'render:post:page'` to be called after the page is rendered
Merge pull request #394 from jonschlinkert/master

fixes plugin stage `'render:post:page'` to be called after the page is r...
feature (postprocess):

Externalizes code for postprocess feature to a plugin. Also renames `pagination-builder.js` to `pagination.js`
0.4.23
Merge pull request #395 from jonschlinkert/master

feature (postprocess): makes postprocess feature a plugin