Merge pull request #84 from pavelbinar/v0.3.0

Add Assemble reference users and Courtesy of less.js
adds "fun facts" concept
ensuring that some objects aren't undefined
adding some migration pages
Merge branch 'origin/v0.3.0'
add uglify in design task
isPermalink(undefined): check if fallback need extension
Merge pull request #88 from hariadi/patch-1

isPermalink(undefined): check if url already have extension
adds rel helper locally, to fix errors
updates migration docs, adds readme
Merge branch 'origin/v0.3.0'

Conflicts:
	package.json
	structure/_extensions/helpers/isActive.js
Merge branch 'origin/v0.3.0'
revert some changes after merge conflicts
this was not easy! adds the `resolve`, `context` and `nav` helpers.
linting, new plugins.