Don't show "uncategorized" if allow_uncategorized_topics is false.
Updated Swedish client translations
revision history: proper word-wrap in markdown view
revision history: no hover state on buttons when disabled
add discourse_diff tests
add onpdiff tests
Support for "no subcategories"
Merge pull request #1740 from davh/master

Updated Swedish client translations
Merge pull request #1739 from vikhyat/uncategorized-topics

Don't show "uncategorized" in the category dropdown if allow_uncategorized_topics is false.
FIX: Large `pre` blocks in emails were increasing the width.
Allow categories with null position, which means sort them based on activity. Mix absolutely positioned (position is not null) categories with null position categories.
FIX: text node emitters should always take strings as parameters even if they
return JsonML.
Improve spacing of registration form, and add instructions to the password field.
FIX: canonical url should not use the CDN
FEATURE: default_code_lang for syntax highlighting is configurable