provide content_url, media_url and full_url functions with full context
added smart language plugin
language plugin: handles second extension instead of prefix
language plugin: fix for empty metadata for resources from tagger plugin,
thumbnail plugin, etc
language plugin: config option renamed
language plugin: try to restore cleaned urls during search for localized
resource in *_url functions
smart urls moved to separate plugin
Merge branch 'master' into lang_extension

Conflicts:
	hyde/ext/plugins/urls.py
	hyde/ext/templates/jinja.py
	hyde/site.py
use fswrap instead of legacy hyde.fs
extended language plugin rewrite for clearification
don't attempt to get any resource if node doesn't exist