FIX: Showing Unread(1) when you weren't tracking the topic. Also
includes performance fix when having MANY new or unread topics.
BUGFIX: you should not be able to edit the category on a PM
small design tweaks
Merge pull request #2015 from awesomerobot/master

small design tweaks
removing background gap on topic closures
Merge pull request #2016 from awesomerobot/master

removing background gap on topic closures
FIX: when shown 403 error page and logging in, it will take you to the same page
Also put the envelope glyph beside topic title edit form for private messages
make sure onebox h3,h4 suppress topmargin
PERF: only rebuild entire top topic table daily
PERF: calculate scores for topics/posts faster

Only look at topics that changed in last day for 15 minuted schedule
Do a full recalc weekly, just in case
BUGFIX: Don't blow up on junk referers
BUGFIX: no need for mock central here
OOPS
small logos should always be proportionate
Merge pull request #2019 from awesomerobot/master

small logos should always be proportionate
fixing width of poster section of topic-list
Merge pull request #2020 from awesomerobot/master

fixing width of user section of topic-list
FEATURE: white_listed_spam_host_domains for domains that are not blocked for spam
BUGFIX: bypass host spam detection for current host
Various cleanups to Ubuntu installation instructions:

* Avoid editing /etc/apt/sources.list add nginx repo, instead create
  /etc/apt/sources.list.d/nginx.list

* Avoid editing /etc/nginx/nginx.conf, instead put server_name_hash_buckets
  setting into discourse.conf

* Proper-case Discourse when it is referring to the product name, so that all
  the lowercase references are to the user created during the installation