copyedit pass on all Site Settings
remove title_sanitize setting
FEATURE: Allow admins to disable specific badges
FIX: user about me editor too wide on mobile
FIX: allow selection of no title
Merge pull request #2539 from iamntz/patch-1

Added type=email on register field
FIX: BBCode sanitization and tests
FIX: don't mess with fixtures when running the specs
FEATURE: disposable invite tokens
Merge pull request #2538 from techAPJ/patch-1

FEATURE: disposable invite tokens
support for EC2 IAM roles with Amazon S3 file store/backup
refactor multiple instances of S3 key check logic to single variable
FEATURE: Require Javascript to activate an account via email link
FEATURE: add site setting leader_links_no_follow to control whether users with trust level 3 or higher have nofollow on their links
FIX: Work with phpBB import style links with ellipsis
FIX: Combobox wasn't matching selected value properly with value of 0
FEATURE: add site setting allow_new_registrations which can be used to block all new account registrations
FIX: Don't put iframes in emails where they are sanitized out. Replace
them with links.
make Send Test Email easier to see
FEATURE: add site settings rate_limit_new_user_create_topic and rate_limit_new_user_create_post to have different rate limits for topic and post creation for new users