Remove documentation references to "pg_dumps/development-image.sql".

There is no such file. Seeding is accomplised via the rake tasks as of
9ab743f351e612830a27afaab8e9b3ddd59da9e2.
Fix code block for git commands
FIX: broken admin user page when must_approve_users is enabled
Fix pasting into the subject field in Firefox.
Specify `dependent: destroy` for UserBadges.
add localization to multiselect popup
FIX: categories with non-ascii names will have broken next page urls
Merge pull request #2168 from zsombor/master

Remove documentation references to "pg_dumps/development-image.sql".
Merge pull request #2172 from vikhyat/firefox-paste-image

Fix pasting into the subject field in Firefox
FEATURE: send the backup/restore logs when operation fails
Merge pull request #2173 from vikhyat/badge-system

Forgot to specify "dependent: destroy" for UserBadges
Fix visual bug
BUGFIX: attachments bust under multisite
add backup links, etc
BUGFIX: no idea how this worked in test
CSS rule for GitHub commit avatars
BUGFIX: proxy_set_header is weird

in particular no inheritance IF proxy_set_header is specified in child
was supposed to say "dismiss unread"
Update combobox when contents are changed.
Don't display granted badges in the badge grant combobox.