Security

Security section
Add USAA

USAA has tfa through Verisign VIP and Pin on mobile apps.
USAA

add Verisign
Changes SpiderOak to no 2FA.

Resolves issue #204.
add TD Ameritrade. also update and reuse the TD Bank icon.

from what I can tell, TD Ameritrade supports the linked hardware OTP generator, but TD Bank doesn't. happy to be corrected if I'm wrong!
Clean up whitespace, lowercase verisign
Merge branch '184', closes #214 #184
Fx Strava indentation
Adding softlayer data
Adding softlayer image
Merge pull request #215 from mpdavis/softlayer

Adding Softlayer
Update domains.yml
adding turbotax image
adding turbotax data.  Fixes #111
Merge pull request #217 from mpdavis/turbotax

Turbotax
favicon
Merge pull request #219 from mpdavis/favicon

Add Favicon
Added Twilio

Twilio can also be used for adding Two Factor Auth with SMS to other applications
added twilio icon
Update payments.yml