Plural-Forms Fix - French
Update Bulgarian l10n

Several new strings are added
Update Bulgarian l10n
Turkish translation updated
Rewrites organization

- Create lib/rewrites.php and move everything from lib/htaccess.php
except the H5BP htaccess functionality into it

- In the config, change add_theme_support('rewrite-urls') to
add_theme_support('rewrites')

- Remove the Apache/LightSpeed HTTPD check for rewrites

- Update docs with better Nginx rewrite rules
config.php organization
Introduce add_theme_support('bootstrap-gallery')

Only apply the Roots [gallery] shortcode if enabled in config.php
Remove conditional feed in head.php

Since most sites will have a blog, simply remove the feed link if
you don't want to include it.
Updated Macedonian translation (thx @maced0n)