Add EnableTwoFactor authentication whitelist and email. close justcoin/snow#363
Fix justcoin/snow#369
Fix justcoin/snow#368
Add chef support. close justcoin/snow#375
1.0.10

Conflicts:
	chef/roles/frontend.rb
	chef/roles/landing.rb
Merge branch 'master' into develop
Merge branch 'release/1.0.10'