Default values for posts/topics fields on Category

When creating categories (or, at least, subcategories), certain integer
values are set to a default of NULL: topics_week, topics_month,
topics_year, posts_week, posts_month, and posts_year. This causes
consistent exceptions when trying to visit `/categories`, with the
offending line being in
`CategoryDetailedSerializer#count_with_subcategories`. This attempts to
coerce nil into Fixnum.

A fix could be to convert to 0 in the code, but these attributes should
really never be NULL. If there are no posts or topics, they should be 0
to maintain data integrity.

Signed-off-by: David Celis <me@davidcel.is>
Update new_user top page redirect reason

The goal of this text is to sublty hint that reading is the way to graduate out of it.
Don't notify about dominating private messages.
BUGFIX: scheduler crash in blocking_tick
Merge pull request #1915 from riking/patch-2

Update new_user top page redirect reason
BUGFIX: plugins not updating after assets:precompile

Now that we have a fancy cache we can nuke all old assets
This is way better cause it ensures all .erbs get re-evaluated
And ensures plugins are updated
SECURITY: check permissions for mailing list

if you deployed this feature in the last 2 hours upgrade asap.
SECURITY: reduce moderator rights

You can now hide particular categories from certain moderators
SECURITY: dissalow mods from seeing PMs
another try fixing this test
fixing watermark/gutter link interference, and also adding a transition to the topic-progress bar, so smooth!
Merge pull request #1917 from awesomerobot/master

fixing watermark/gutter link interference
Merge pull request #1916 from vikhyat/pm-dominating

Don't notify about dominating private messages
Be slightly less aggressive at clearing assets
BUGFIX: make sure moderators can't view topics they aren't allowed to
Client and Server side routes for a Group
More templates for the group page
Move `Discourse.Group` into public models
Return a promise from `Discourse.Group.findAll()`
Rename `load` to `loadUsers` which is what the method was actually
doing.