Fix minor bug in URI/path comparison.

If `uri` is `/subdir/` and the `item.url` is `/subdir/index.html` then
`index.html` needs to be added to `uri` and not `item.url`.
Refactor for 2.0
Add a cyclic dep in example site
More refactoring
Drop support for old style metadata
Switch to main branch of marked and monkey patch to resolve url.
Fix a bug that caused markdown rendering to fail if gfm code language was set to something not supported
Marked 0.2.x
Async 0.2.x
Add plugin loading to environment
Implement view loading and refactor plugin view handling
Add reverse lookup to dependency graph
Add view rendering helper and break page's view to a reusable view
Expose some api on environment
Expose loaded plugins
Generators!
Clean up generator runner
Missing import
Add option for max files open to avoid EMFILE errors and create intermediate directories when rendering.
Move readdirRecursive to utils