added security service latch
added doc and tfa field
move latch to providers
update latch features
Added GREE
alphabetize
Added GREE logo and docs

Also changed twofactorauth.org docs links to be HTTPS.
Salesforce supports 2fa
Merge pull request #796 from ffr4nz/master

added provider Latch
Merge branch 'jdavis_master' into salesforce
Put Salesforce in the right alphabetical order
Add Webroot to security.yml
Merge pull request #805 from jamcat22/patch-1

Add GREE to gaming.yml
Merge pull request #835 from ilyakatz/salesforce

Salesforce supports 2fa
Merge pull request #838 from mxxcon/Webroot

Add Webroot to security.yml
Ensure contribution link displays on resize

Ensure that the GitHub contribution link displays correctly when the
window is resized. This issue fixes #571.
levelup doesn't support TFA
Merge pull request #845 from psgs/responsive-categories

Ensure contribution link displays on resize
correcting twitter handle
Merge pull request #847 from ilyakatz/levelup

levelup doesn't support TFA