Adds THUMBNAIL_KEEP_NAME which if set puts the thumbnail in a folder named
like the key in THUMBNAIL_SIZES.
update to the neighbors plugin to retrieve neigbors for categories and subcategories
altered plugin to work with updated subcategory plugin
new plugin: i18n_subsites

This plugin extends the translations functionality by creating i8n-ized
sub-sites for the default site.
This commit implements the basic generation functionality.
i18n_subsites plugin: implement jinja2.ext.i18n support

this commit introduces optional support for translatable templates
Merge pull request #142 from alistairmagee/custom_article_urls

Custom article URLs
Merge pull request #141 from alistairmagee/neighbors

Add categories and subcategories support to Neighbors plugin
Minor fixes to Subcategory plugin README
More fixes for Subcategory plugin README
fix structure of disqus_static plugin and update README
Minor fixes to Custom Article URLs plugin README
Merge pull request #144 from idyedov/update_disqus_static

Fix structure of disqus_static plugin and update README
i18n_subsites: consider templates lang, expand docs

this commit removes the need to make a dummy translation for
the language in which the templates are written.
This only affects themes using jinja2.ext.i18n.
The I18N_THEMES_LANG is introduced to address this issue.

Also expanded the docs for making gettext .po files with babel.
i18n_subsites: fix HIDE_UNTRANSLATED_CONTENT

1. was removing items of an active iterator -> only first worked
2. Article inherits Page, so first check if is Article
i18n_subsites: improve develop server support

1. main site url root fix
2. support autoreload mode
Also removed trailing slash on dir name.
18n_subsites: use configure_settings() to sanitize

Also needed for LOCALE overrides, etc.
Merge pull request #145 from smartass101/master

i18n_subsites: consider templates lang, expand docs, several fixes
Merge pull request #118 from deepy/master

Add option to keep original filename and put thumbnail in a folder instead
i18n_subsites: add lang_subsites template var, improve docs

- the new variable makes it easier to implement language buttons
- a short howto on language buttons is also provided
- the dictionary mapping template vars are now OrderedDict
  for consistent-looking language buttons
Merge pull request #146 from smartass101/master

i18n_subsites: add lang_subsites template var, improve docs